bluuebunny/crossref_metadata_2025 huggingface dataset:
PHOTOLUMINESCENCE STUDIES ON InxGa1-xAs-GaAs STRAINED QUANTUM WELLS STRUCTURE UNDER HYDROSTATIC PRESSURE
Authors: WANG LI-JUN  , HOU HONG-QI  , ZHOU JUN-MING  , TANG RU-MING  , LU ZHI-DONG  , WANG YAN-YUN  , HUANG YI  ,   中国科学院物理研究所
Published: November 2020

In this article we report the results of photoluminescence studies on In0.25Ga0.75 As-GaAs straiaed quantum wells grown by molecular beam epitaxy under pressure at 77 K. The applied hydrostatic pressure ranges from 0 to 50 kbar. The pressure coefficients of T valley of (InGa)As-GaAs strained quantum wells are presented. We have observed the crossover between the energy level in the well and X valley in the barrier GaAs. With the analysis of its behavior under pressure, the ratio of conduction band offset to valence band offset in In0.25 Ga0.75 As-GaAs heterojunction is determined as Qc =△Ec:△Ev = 0.68:0.32. The theoretical studies on (InGa) AsGaAs strained quantum wells under normal pressure fit the experimental results very well. Some discussions about (AlGa)As-GaAs quantum wells are also included in this paper.
THE EFFECTS OF LOW TEMPERATURE PROTON IRRADIATION ON Y-Ba-Cu-O AND La-Sr-Cu-O
Authors: XIONG GUANG-CHENG  , LI HONG-CHENG  , O. MEYER  , G. LINKER  ,   (1)Kerntorschungszentrum Karlsruhe GmbH,Institut for N ukleare Festkorperphysik.,P. O. Box 3640,7500 Karlsruhe,B. R. D.; (2)北京大学物理系; (3)中国科学院物理研究所
Published: November 2020

The influence of low temperature proton irradiation on the transport property of high Tc oxide Y-Ba-Cu-O and La-Sr-Cu-O is studied by a standard four probe method. After irradiation, besides the resistivity of the sample increases and the superconducting transition temperature Tc decreases, the dp/dT of the sample increases and a metal-nonmetal phase trasition occurs. A strong annealing effect is found during warming up irradiated samples to room temperature. After room temperature annealing, nearly 60% of changes of the sample resistance and Tc which were caused by low temperature proton irradiation can be recovered. These phenomena can be attributed to that the electronic band structure of the high Tc oxide superconductor is very sensitive to the random defects.
THE MONTE-CARLO SIMULATION OF THE FLUORESCENCE ENHANCING EFFECT IN PIXE
Authors: WANG XI-DE  , PAN ZHENG-YING  , HUANG FA-YANG  , XIA RONG  ,   复旦大学原子核科学系
Published: November 2020

With monte-carlo method, the primary and second X-ray fluorescence excited by proton in thick target were simulated, and the fluorescence enhancing factors were obtained.The various enhancing factors were calculated with different proton incident energies and angles, X-ray ejection angles, and elements and their weight percentage in samples. Besides, the results of PIXE basically agreed with standard composition of steel samples using the calculated enhancing factors.
THE MODEL OF TWO DIMENSIONAL SPIN GLASS WITH NONMAGNETIC DEFECTS
Authors: CHEN LING-FU  , WANG QIANG-HUA  ,   南京师范大学物理系
Published: November 2020

In this paper, we present a model of 2-D RICKY spin glass with nm1/21m beins the magnetic impurity concertration and 1 the mean free path (this corresponds to a large concertration of nonmagnetic defects). The specific heat and the magnetic susceptibility at low and high temperatures are calculated. The percolation theory is applied to the transition region. The broad maximum of the specific heat and the "cusp" of the magnetic susceptibility are explained.
PHYSICAL INVESTIGATION ON TUNGSTEN BRONZE CRYSTALS
Authors: LI LI-MAN  , WANG GANG  ,   (1)北京钢铁学院; (2)中国科学院物理研究所
Published: November 2020

KxWO3,NayWO3 and KxNayWO3 crystals were prepared by fused salt electrolysis. The X-ray diffraction, Raman, Infra-red we may conclude and condutivity me. asurements were made. From our results that KxNayWO3 is formed by intercalating Na+ ions into the tetragonal KxWO3 crystal lattice. A mechanism of ionic conduction is suggested.
EFF ECTS OF STRUCTURAL RELAXATION AND CRYSTA-LLIZATION ON SUPERCONDUCTING PROPERTIES IN AMORPHOUS ALLOY Zr87.7Si12.3
Authors: ZHOU XIAN-YI  , ZHAO YONG  , ZHANG QI-RUI  , LIU ZHI-GUO  ,   (1)南京大学固体微结构实验室; (2)中国科学技术大学物理系
Published: November 2020

The 1 hour isochronal annealing treatment has been made on amorphous alloy Zr87.7Si12.3. The changes of the superconducting critical parameters, Tc and H(C2) and their transition width have been measured for different annealing temperatures. The different change laws of metal-metal type amorphous alloys were observed. The experimental results-were discussed in connection with the toplogical short range order and the chemical short range order in the process of structural relaxation and the corresponding crystallization mechanism.
PEAK-SWITCHING OF THE PHOTOELECTRON SPECTRUM
Authors: YAO GUAN-HUA  , XU ZHI-ZHAN  ,   (1)中国高等科学技术中心(世界实验室)凝聚态和辐射物理分中心; (2)中国科学院上海光学精密机械研究所
Published: November 2020

The photoelectron spectrum from autoionizing atoms in strong laser field is investigated on the basis of ref [12] . Peak-switching similar to the corresponding effect in strong field multiphoton ionization is found, implying that the second-order ionization processes and high-order photoelectron peaks play essential roles in strong laser-field induced autoionization-These results show that many of previous results need to be revised.
A STUDY ON CRYSTALLIZATION KINETICS OF SUPERCON-DUCTING METALLIC GLASS Zr78Co22
Authors: ZHOU XIAN-YI  , LIU ZHI-GUO  , ZHU YU-PING  , CHEN GUANG-HUI  , CHEN YONG  , ZHANG QI-RUI  ,   (1)南京大学固体微结构物理实验室和现代分析中心; (2)中国科学技术大学物理系,中国高等科学技术中心(世界买验室)理论物理分中心; (3)中国科学技术大学物理系,中国科学院国际材料物理中心
Published: November 2020

The structure, structural relaxation and crystallization of metallic glass Zr78Co22 are investigated by the small angle X-ray diffraction, the wide angle X-ray diffraction and the field ion microscopy, together with the measurements of the superconducting critical temperature and the microhardness. The results indicate that there exists obviously the amorphous phase separation in the as-quenched state of the metallic glass Zr78Co22. The compositions of two segregated amorphous phases are similar to pure Zr and Zr4Co respectively. In the process of structural relaxation, the changes of the toplogical short range order are essential and controlled by the nucleation-growth mechanism. When the number of nucleation is sufficient, the segregation grow homogenously and identically.
THE GEOMETRY SIZE EFFECTS OF THE QUASI-FLUXON OF EXCITATION IN THE CIRCULAR SYMMETRIC ANNULAR JOSEPHSON JUNCTION
Authors: XU KUN-MING  , SHEN YA-FEI  , YAO XI-XIAN  ,   (1)东南大学计算科学与工程系; (2)南京大学物理系; (3)浙江大学物理系
Published: November 2020

In this paper, the geometry size effects of the ringshape quasi-soliton solutions in the perturbed Sine-Gordon equations (SGE) in the circular symmetric annular Josephson junction are investigated with numerical method. The perturbed SGE, when the inner radius r0 of the circular symmetric annular junctions is larger then or equal to 7.5λJ, there exists a kind of ring-shape quasi-soliton solutions, which correspond to the quasi-fluxon of excitation in the circular symmetric annular Josephson junction, and the first zero-field step also. The range of the first zero-field step depend strongly on the size of the inner radius r0 and widths (αr0-r0) of the circular symmetric annular junctions, but the geometry size effects of the nature of the ring-shape quasi-solitons are more complicated.
A MODIFIED WARREN-AVERBACH METHOD FOR THE SAMPLE WITH A MICRO-STRAIN GRADIENT IN ITS SURFACE LAYER
Authors: YANG LIU  , YAO HONG-NIAN  ,   浙江大学
Published: November 2020

This paper deals with X-ray diffraction profile analysis for the sample with a micro-strain gradient in its surface layer. On the assumption that the variation of micro-strain L2> with depth t is expressed as L2>-Σam(L)tm, Warren-Averbach method is modified so that it can be used in this case. For the special case of L2>=α0+a1(L)t, the relationship between the micro-strain L2> and the depth t can be determined by analyses of diffraction profiles belonging to two different radiations.
SIMULATION STUDY OF DIVERGENT BEAM X-RAY DIFFRACTION BY CRYSTALS
Authors: ZHANG JIAN-ZHONG  , CAO YAN-NI  ,   南京大学物理系,南京,210008
Published: November 2020

Acoording to the crystal symmetry, diffraction geometry and the diffraction laws, the complicated divergent beam X-ray diffraction has been studied. A method for simulating such diffraction is described. The computer generated pseudo-Kossel line patterns are exactly consistent with those recorded in experiment and the indices of all diffraction lines in the patterns can be identified. A set of standard divergent diffraction diagrams related to 〈100〉, 〈110〉 and 〈111〉oriented Si single crystals are completed successfully by computer.
EXTENDED POTENTIAL MODEL OF TETRAVACANCY IN SILICON
Authors: SHEN SAN-GUO  , FAN XI-QING  , ZHANG DE-XUAN  , REN SHANG-YUAN  ,   (1)郑州大学物理系,郑州,450052; (2)中国科学技术大学物理系,合肥,230026
Published: November 2020

In this paper, using the extended potential model, the symmetrized wavefuntion of the unpaired electron of tetravacancy (V4-) in silicon is calculated. We obtain the localization parameters η2, s-character fractions α2, p-character fractions β2 and hyper-fine constants of the unpaired electron on atoms nearest to the defect. V4- is determined for A1(C3v) symmetric state of the energy 0.78eV. Theoretical values are compatible with the existing experiments. Our results point out that η2 on single dangling bond of V4- is smaller than that of other defects with single dangling bond, this is because the potential distribution for V4- deviates from the single dangling bond case.
FINITE WAVENUMBER EFFECT ON AC JOSEPHSON CURRENT
Authors: WU YING  , YAO KAI-LUN  ,   华中理工大学物理系,武汉,430074
Published: November 2020

A formula of the Josephson current in the presence of microwave and static magnetic field, taking finite wave-number effect into account, is derived. Finite wavenumber effect on ac Josephson current is discussed according to this formula. It can be used to explain such anomalous phenomena as missing of some rf-induced steps in the I-V curve, asymmetry of the I-V curves.
STUDIES OF RAMAN FREE ELECTRON LASER BY AN OPTICAL KLYSTRON CONFIGURATION
Authors: CHEN JI-ZHONG  , WANG MING-CHANG  , WANG ZHI-JIANG  , LU ZAI-TONG  ,   中国科学院上海光学精密机械研究所,上海201800
Published: November 2020

A design of an over-all experiment of Raman free electron laser with an optical klystron configuration is put forward. The gain and efficiency improvement of free electron laser by an optical klystron configuration has been studied by one dimensional single-particle model.
MECHANICAL ALLOY METHOD AND FORMATION ABILITY OF FexAl100-x AMORPHOUS POWDER
Authors: WANG GEN-MIAO  , CHEN HUI-YU  , WANG WEI-HUA  , DONG YUAN-DA  ,   (1)中国科学技术大学结构和成份分析中心,合肥230026; (2)中国科学技术大学物理系,合肥230026; (3)中国科学院固体物理研究所,合肥230031
Published: November 2020

The FexA100-x(x = 10, 20,30,40,50, 60, 70) amorphous powder were prepared by ball grinding through different time. The X-ray diffraction indicates that the intensity of diffraction peaks for each sample decreases more and more while the width of peaks becomes wider due to ball grinding time increasing. This results from the formation of amorphous portion in samples. On the other hand, X-ray diffraction and magnetic properties measurements show that to get the same ratio of amorphous in samples, we must take different time to ball grind the different content powder sample, Fe50Al50 crystalline powder can be transformed into amorphous powder most easily.
A SPIN-ONE DILUTED ISING MODEL ON A HONEYCOMB LATTICE
Authors: WANG ZHEN-LIN  , LI ZHEN-YA  ,   苏州大学物理系,苏州,215006
Published: November 2020

In this paper, the randomly site-diluted (quenched case) spinone Ising model on a honeycomb lattice is investigated under the constraint exp(K)cosh(J) = 1. The critical temperature and the magnetization as functions of concentration of spins and the percolation critical value are obtained.
EXPLANATION OF THE QUANTIZED MAGNETORESIS-TANCE IN MULTPLY CONNECTED PERIMETERS IN TWO-DIMENSION ELECTRON SYSTEMS
Authors: PENG JIAN-PING  , ZHOU SHI-XUN  ,   复旦大学物理系,上海200433
Published: November 2020

We explain the quantized magnetoresistance in multiply connected perimeters in two-dimensional systems observed by Fang and Stiles based in terms of a model which states that the two-terminal resistance of a two-dimensional electron system in a quantizing magnetic field in any open geometry is given by h/fe2, where f is the Landau filling factor.
SIGN DISTRIBUTION OF TWO-PHASE STRUCTURE INVARIANTS FOR THE CRYSTAL cis-[PtDMBA(ClCH2CO2)2]
Authors: GUO DONG-YAO  , GUO SHI-SHAN  ,   吉林大学理论化学研究所,长春130023
Published: November 2020

The two-phase structure invariants for the crystal, ψ2=ψH+ψH, are calculated, and the statistical distribution of negative Ψ2 with |E| is obtained. The results for this crystal show that Hauptman's probabilistic formula (1) may reliably determine the signs of Ψ2 as long as their |E| values are not too small in practical use. The computational results for other 5 crystals, C18H24NO4 and its derivatives, also support the above conclusion
NONLINEAR DYNAMICS OF ONE-DIMENSIONAL CRYSTALLINE BEAM (Ⅱ)
Authors: SHAO MING-ZHU  , I. HOFMANN  , LUO SHI-YU  ,   重庆交通学院,重庆,630073,西南师范大学,重庆,630715
Published: November 2020

An equation for coherent oscillation excited by parameters for one-dimensional Coulomb chain has been derived, which includes constant cooling force. An approximate solution of the system has been found using a multiple scale method, and its stability discussed by classical method. Besides, we have also discussed global bifurcation of the system by Melnikov method, and derived a critical error of gradient field for ESR at GSI.
ISOVECTOR GIANT RESONANCES ON HOT NUCLEI
Authors: LI GUO-QIANG  ,   杭州大学物理系,杭州,310028
Published: November 2020

The self-consistent semi-classical sum rale approach is utilized to study the properties of isovector giant resonances on hot nuclei. The temperature effect on the average excitation energies of isovector GMR, GDR and GQR are evaluated with extended Skyrme forces.
MEASUREMENT OF SMALL ANGLE X-RAY SCATTERING WITH DOUBLE CRYSTAL DIFFRACTOMETER
Authors: WEI MING-JIAN  ,   武汉工业大学,武汉,430070
Published: November 2020

Double crystal diffractometer applied to measure SAXS is very satisfactory, since it has high resolving power and relatively small measure area. But for a long time it has not been used widely, because it has comparatively strong background which may cover the signal of SAXS. We point out that this background results from two kinds of its sources, one is the fluorescence come from the second crystal; the other is the effect of tail part of the rocking curye of crystal used. The contribution of the first source can be subtracted by a pulse height analyser. We present here a method that can subtract the effect of the tail part of rocking curve. Experiment domonstrates that this method is satisfactory.
MODIFICATION OF THE SURFACE SECOND-HARMONIC GENERATION FROM AN OXYGEN-COVERED SILVER BY THE OXYGEN-SILVER INTERACTION
Authors: LI LE  , LIU YANG-HUA  , YU GONG-DA  , WANG WEN-CHENG  , ZHANG ZHI-MING  ,   (1)复旦大学物理系,上海,200433; (2)苏州大学物理系
Published: November 2020

In this paper, we report the discussion on the nonlinear optical properties of an oxygen-covered Ag as well as the experimental studies with optical secondharmonic generation (SHG) in an ultrahigh vacuum system. The resulted SH signals are found to be very sensitive to the charge transfer between oxygen and silver. Based on the SHG measurement of oxygen adsorption dynamics, we seggest that the unmber of electrons donated to silver from the π-filled orbital might be more than that transfered from silver to the π* anti-bonding orbital of adsorbed oxygen molecules. Besides, the temperature programmed dissociation of adsorbed oxygen molecules was investigated, which could be explained in the framework of a simple model.
MONTE CARLO CALCULATION OF PREFERENTIAL SPUTTE-RING IN MULTI-COMPONENT TARGET
Authors: PAN ZHENG-YING  , CHEN JIAN-XIN  , WU SHI-MING  , HUO YU-KUN  ,   复旦大学原子核科学系,上海,200433
Published: November 2020

Based upon the binary collision approximation (BCA), the Monte Carlo methods are employed to study sputtering of multi-component amorphous targets. Total and partial sputtering yields, energy and angular distribution and the escape depth distribution of sputtered particles are given. The changes of surface concentrations are also studied The results indicate that the collisional effect may account for the preferential sputtering, which plays an important role in surface composition changes due to ion bombardment.
THE STEPWISE REGRESSION ANALYSIS FOR SIMULATION OF THE OVERLAPPED M?SSBAUER SPECTRUM
Authors: XU ZU-XIONG  , MA RU-ZHANG  ,   北京科学技术大学材料物理系,北京,100083
Published: November 2020

In view of the multivariate regression analysis, we proposed a stepwise regerssion analysis of the distibution of a hyperfine parameter with non-negative constraints in simulation of the overlapped M?ssbauer spectrum. In this method only those rational subspectra, which satisfy both importance and non-negative constraints according to the information in the studied M?ssbauer spectrum, could be comprised in the simulated result. The present method showed two advantages, i.e., fewer calculations and the optimum simulation result which is rational and has least mean square error.
LIGHT ABSORPTION OF POLYDIACETYLENE CHAINS ——GREEN'S FUNCTION STUDY
Authors: PENG JING-CUI  ,   湖南大学应用物理系,长沙,410082
Published: November 2020

Light absorption of polydiacetylene chains has been investigated using Green's function. In tight-binding approximation, we defined a Hamiltonian at first, then computed two-electron Green's function using random phase approximation, discussed some properties of excited-states for PDA's, calculated light absorption spectra and compared with experiments.
VARIATIONAL CALCULATION FOR ELECTRON CORRELA-TIONS OF QUASI ONE-DIMENSIONAL SYSTEM
Authors: MAO HUI-MING  , SHAO JIN-SHAN  , WANG HONG-WEI  , FENG WEI-GUO  , SUN XIN  ,   (1)江西师范大学物理系,南昌,330027; (2)江西师范大学物理系,南昌,330027,江西省计量局; (3)上海复旦大学物理系,上海200433
Published: November 2020

For the quasi one-dimensional electron systems with coulomb interaction, a new model is presented. The form of effective Coulomb potential is derived. Based on the correlated wave function theory, the many-body wave function is obtained on the basis of the collective oscillation behavior of the electron gas. The pair correlation functions and correlation energies of the different electron densities are obtained. The pair correlation functions obtained in this paper are positive definite and satisfy the normalization condition.
THE MULTI-PHOTON FOKKER-PLANCK EQUATION OF A DRIVEN OPTICAL SYSTEM WITH MIXED ABSORPTION AND DISPERSION AND THE STEADY STATE EQUATION
Authors: LIN REN-MING  , ZHANG LIN  ,   福建师范大学物理系,福州,350007
Published: November 2020

The systematic method of Fokker-Planck equation (FPE) of the generalized Wigner distribution is used to study the multi-photon transition process of a driven optical system, which has the mixture of absorptive and dispersive feature. The multi-photon and mixture of absorptive and dispersive feature FPE and steady state equations are obtained. The properties of the steady state equation is discussed.
BIREFRINGENCE IMAGE OF A LARGE HEXAGONAL LAMELLAR INCLUSION AND COMPUTER SIMULATION
Authors: XU XIU-YING  , ZHANG XING-KUI  , FENG DUAN  , Lü PENG  ,   南京大学物理系固体物理研究所,南京,210008
Published: November 2020

Birefringence image of a large hexagonal lamellar inclusion have been observed in GGG single crystal. The strain field of inclusion and long-rang strain field are analyzed with Brace-Kohler compensator. The theoretical calculation and computer simulation are in agreement with the result of experiment.
ORTHONORMALIZED EIGENSTATES OF OPERATOR αN AND THEIR PROPERTIES
Authors: PENG SHI-AN  , GUO GUANG-CAN  ,   (1)河北师范学院物理系,石家庄,050091; (2)中国科学技术大学物理系,合肥,230026
Published: November 2020

In this paper, a general method for constructing orthonormalized eigenstates of operator αN is presented. The emphasis is put on study of mathematical structure and quantum statistical properties in the case N=3. It is found that all the orthonorma-lizetl eigenstates have nonclassical effects and they form a nonclassical complete representation.
MEASUREMENT OF POLOIDAL MAGNETIC FIELD OF TOKA-MAK BY LASER EXCITED FLUORESCENCE OF HIGH ENERGY Li BEAM
Authors: ZHENG SHAO-BAI  , YANG XUAN-ZONG  , W. P. WEST  , D. M. THOMAS  ,   (1)美国通用原子能公司; (2)中国科学院物理研究所,北京,100080
Published: November 2020

In this paper the principle, experimental setup and technique of the tokamak poloidal magnetic field measurement by laser excited fluorescence of high energy Li beam are presented. The main diffeculties and its limitations are also mentioned.
SELF-OSCILLATION DUE TO THE DRIFT OF IONIC CHARGE CARRIERS IN LIQUID CRYSTAL OPTICAL BISTABILITY
Authors: TANG ZE-SUN  , WANG PENG-YE  , DAI JIAN-HUA  , ZHANG HONG-JUN  ,   (1)北京航空航天大学,北京,100083; (2)中国科学院物理研究所,北京,100080
Published: November 2020

The self-oscillations in a hybrid liquid crystal optical bistable device due to the competition between the DC electric field-induced drift of ionic charge carriers and molecular reori-entation in the liquid crystal are observed experimentally. The relaxation equations of the system are given. The numerical analysis are in qualitative agreement with the experimentalresults.
THEORY OF SECOND HARMONIC GENERATION AT METAL SURFACE
Authors: LI LIE-MING  , SUN XIN  , FENG WEI-GUO  ,   (1)复旦大学物理系,上海,200433; (2)同济大学应用物理系,上海,200092; (3)中国科学院上海技术物理研究所红外物理开放研究实验室,上海,200083
Published: November 2020

For the second harmonic generation at metal suriaces, the existing theoretial results obtained from hydrodynamics and the density functional theory are one order of magnitude deviated from the experimental data. We calculate the second harmonic generation at Al, Mg and Ag surfaces by using the correlated basis function theory. Since the electron correlation can be considered more property in this approach, our theoretical results are closer to the experimental data.
PREPARATION AND SUPERCONDUCTIVITY OF SINGLE PHASE Bi1.65Pb0.35Sr2Ca2Cu3Oy WITH ZERO RESISTANCE TEMPERATURE 106.5K
Authors: WANG SHUN-XI  , CHEN XIAN-HUI  , XIA JIAN-SHENG  , SHA JIAN  , WEI HONG-BIN  , MA JUN  , CHEN ZU-YAO  , QIAN YI-TAI  , ZHANG QI-RUI  ,   (1)中国科学技术大学物理系,合肥,230026; (2)中国科学技术大学物理系,合肥,230026,浙江大学物理系,杭州,310027; (3)中国科学技术大学应用化学系,合肥,230026
Published: November 2020

Samples with nominal composition Bi2-xPbxSr2Ca2Cu3Oy(x = 0.30;0.35;0.40;0.45) have been prepared by solid state reaction. Phase and structure analyses have been performed, and the resistance-temperature relation and dc susceptibility have also been measured. The results show that the sample with x = 0.35 is a single-phase material. X-ray analysis and electron differaction indicate that its phase structure is similar to that of 2223 phase, it is tetragonal with a = b = 5.414?, c = 37.106?, we observed also the modulated structure along a and b. The results of resistance-temperature and dc susceptibility measurement show that, when T = 50 K, there is only one superconducting phase of 107K. In addition, we find that the preparation condition of the single-phase material (composition, sintering temperature and the quenching rate) is stringent. Like the 1-2-3 phase material, the oxygen content not only influences the phase, zero-resistance temperature of the sample, but also influences the transport property of normal state.
ELASTIC FIELD OF A DISLOCATION UNIFORMLY MOVING ON THE PHASE BOUNDARY
Authors: YANG SHUN-HUA  , WANG CHAO-YANG  ,   北京科技大学材料物理系,北京,100083
Published: November 2020

We extended the method of Eshelby et al.for treating a static straight dislocation in infinite anisotropic medium, to compute the elastic field of a dislocation uniformly moving on the phase boundary of a two-phase medium. The simple theory proposed in this paper is applicable in general, and can be employed directly to investigate the behavior of a tranformation dislocation in high speed motion on phase boundary, and therefore be helpful in understanding the role played by the motion of transformation dislocation in diffusionless phase transformation. Finally, the method used in this work and the discontinuity appeared in the computed field are discussed in brief.
BOUND STATE WAVE FUNCTIONS OF CHARGED FERMION AND ABELIAN DYON AND THEIR APPLICATION
Authors: ZHANG JIAN-ZU  , QI YONG-CHANG  ,   (1)山西大学物理系,太原,030006; (2)中国高等科学技术中心(世界实验室)理论物理分中心
Published: November 2020

The bound state wave functions and energy levels of the system of charged fe-rmion and abelian dyon are obtained for the dyon charge Zd dc and the totai angular momentum j≥│q│+1/2. The transition matrix elements of this system in an external electro-magnetic field, are calculated, and corresponding selection rules are obtained. In particular, it is found that the electric dipole transition △j=0 exists, which is different from hydrogen-like atom and violates the parity conservation.
STUDY ON THE STRUCTURE AND ELECTRIAL PROPERTIES OF THE COPPER-TUNGSTEN-PHOSPHATIC NON-CRYS- TALLINE IONIC CONDUCTORS
Authors: CUI WAN-QIU  , ZHOU DE-BAO  , SHEN ZHI-QI  , LIAN CONG  ,   武汉工业大学材料科学与工程系,武汉,430070
Published: November 2020

The glass forming-region of the Cul-Cu2O-WO3-P2O3 system with Cul content being 30 mol% is given. The ac conductivity of the specimens is measured. The relation between conductivity and WO3 content is determined. The structure of this system is studied by IR spectra, complex impedance diagrams, RDF and SEM. The relation between the electrial properties and the structure is discussed.
SOLITON SOLUTIONS OF THE GENERALIZED NONLINEAR SCHR?DINGER EQUATION WITH HIGHER-ORDER CORRECTIONS BY THE DIRECT METHOD OF HIROTA
Authors: LIU ZHONG-ZHU  , HUANG NIAN-NING  ,   (1)华中理工大学物理系,武汉,430074; (2)武汉大学物理系,武汉,430072
Published: November 2020

By using the direct method of Hirota, explicit multi-soliton solutions are found for the generalized nonlinear Schr?dinger equation with higherorder corrections which describes the ultra-short pulse propagation along monomode optical fibers.
REACTION PROCESS IN THE Bi-Pb-Sr-Ca-Cu-O SYSTEM
Authors: XI ZHENG-PING  , ZHOU LIAN  , JI CHUN-LIN  ,   (1)东北工学院,沈阳,110006; (2)西北有色金属研究院,宝鸡,721014
Published: November 2020

The reaction process of formation of the Bi-Pb-Sr-Ca-Cu-O superconductor by means of a three-step reaction method was studied by high-temperature X-ray diffraction meansurement and DTA technique. The 2212 phase began to form at about 740℃ from the mixture of the Bi-Pb-Sr-Ca-O precursor-CuO, and the 2223 phase at about 825℃. The 2212 phase melted incongruently to the 2201 phase and a liquid phase at about 875℃ and the 2223 phase melted a liquid phase at about 935℃. In the crystallization of the 2212 phase, strong c-orientation forms easily.
EXPLANATIONS TO THE ANOMALOUSLY LARGE RADII OF NUCLEI NEAR THE NEUTRON DRIP LINE
Authors: REN ZHONG-ZHOU  , XU GONG-OU  ,   (1)南京大学物理系,南京,210008; (2)南京大学物理系,南京,210008;兰州大学现代物理系,兰州,730001
Published: November 2020

Based on the analysis of the binding energy in light nuclei near the neutron drip line, the nuclei 6He,11Li ,14Be and 17B are considered as core-neutron-neutron three-body systems. The core-neutron and neutron-neutron interactions are assumed to be the weakly attractive exponential potentials. It has been shown that the three-body system can have a bound state even if any two constituents of the system cannot have a bound state. The anomalously large root-mean-square radii of 6He,11Li,14Be and 17B is due to the weak binding of the outer neutrons.
MONTE-CARLO STUDIES OF RADIATION DAMAGE INDUCED BY FUSION (II)——SPUTTERING
Authors: SHAO QI-YUN  , CHEN JIAN-XIN  , WU SHI-MING  , PAN ZHENG-YING  , HUO YU-KUN  , GAO XING-HUA  ,   (1)复旦大学物理二系,上海,200433; (2)中国科学院等离子体物理研究所,合肥,230031
Published: November 2020

By means of the monte-carlo method based on the binary collision approximation, this paper investigates sputtering caused by fusion α-particles at the first wall of stainless steel (Fe0.73Cr0.18Ni0.09). The parameters adjusted in accordance with a comparison of the calculated and measured sputtering yields of the elements Fe, Cr and Ni were used to study the partial sputtering yields, energy distribution, angular distribution and depth distribution of origin of the sputtered particles, as well as the dependence of those quantities with the angles of incidence. The results show that by taking into account the energy and incidence angle distribution, the averaged sputtering yield of α-panicles in stainless steel is about 0.375, and the higher energy component of α-particle plays minor role so far as sputtering is concerned.
SQUEEZING AND PHOTON STATISTICS
Authors: LIU ZHENG-DONG  , LIU SAN-QIU  ,   江西师范大学物理系,南昌,330027
Published: November 2020

In this paper, the relation between squeezing and photon statistics is studied. The photon statistics of cavity field can be changed by injecting atoms at such a low flux thar at most one atom at a time is present inside the lose-free cavity, deeper squeezing may be achieved.
THE STEEPEST DESCENT PERTURBATION THEORY FOR THE EXCITED STATE OF A QUANTUM SYSTEM
Authors: WEN GEN-WANG  ,   湖南师范大学物理系,长沙,410081
Published: November 2020

The steepest descent perturbation theory is extended to the calculation of the energy and eigenfunction of the excited state of a quantum system. In case of the orthogonality of the trial function for the excited state to those for lower-energy state or ground state in the same symmetry class is preserved, the variational collapse to lower energy state can be avoided in this proposal. An iterative procedure is given for generating better eigenvalue and eigenfunction of the excited state without requiring an infinite summation over reference states as in conventional perturbation theory. This new perturbation method can be applied to calculate the excitation energy and wave function of excited states for any many-body quantum system to a high degree of accuracy without so much computational effort as in conventional method.
GENERALIZED SU(2) COHERENT STATE OF SPIN SYSTEM
Authors: HUANG HONG-BIN  ,   东南大学物理系,南京,210018
Published: November 2020

This paper introduces the generalized SU(2) coherent state of spin system. Its squee ing and antibunching, and generation are discussed. It is shown that under the contraction of group SU(2) to the harmonic-oscillator group, the generalized SU(2) coherent state transforms to the generalized Glauber coherent state, the related results of the contraction are also given.
INTENSITY RATIO METHOD FOR MEASURING ANOMALOUS SCATTERING FACTOR
Authors: ZHAO ZONG-YAN  , TOMOE FUKAMACHI  , MASAMI YOSHIZAWA  , KENJI EHARA  , TETUO NAKAJIMA  , TAKAAKI KAWAMUKA  ,   (1)安徽大学物理系,合肥,230039; (2)高工-物理学研究所放射光实验施设,日本,茨城,筑波,大穗,305; (3)琦玉工业大学,日本,琦玉,冈部,369-02; (4)山梨大学,日本,山梨,甲府,400
Published: November 2020

This paper reports the study of the intensity ratio method for measuring anomalous scattering factor, by means of which the anomalous scattering factor of Ga atoms in GaAs near K absorption edge was well determined. This paper also discusses and deals with the problems that may appear when this method is used.
PRODUCTION OF VACUUM POSITRONIUM ATOMS
Authors: HAN RONG-DIAN  , GUO XUE-ZHE  , WENG HUI-MIN  , SHI XING-JUN  , XIE LI  ,   中国科学技术大学近代物理系,合肥,230026
Published: November 2020

Positronium atoms are formed efficiently by slow positron beam hitting a solid target surface in vacuum. The fraction of positrons which formed positroniums is determined by applying the "peak method" to the energy spectra of the positron annihilation radiation measured at different target temperatures and incident positron energies. The fraction is dependent on the target material, temperature and incident positron energy. For germanium, the fraction is as high as 80%.
HIGHER-ORDER SQUEEZING AND QUASIPROBABILITY DISTRIBUTION FUNCTIONS OF EVEN AND ODD COHERENT STATES
Authors: XIA YUN-JIE  , LI HONG-ZHEN  , GUO GUANG-CAN  ,   (1)曲阜师范大学物理系,曲阜,273165; (2)中国科学技术大学物理系,合肥,230026
Published: November 2020

The higher-order squeezing and quasiprobability distribution function of even and odd coherent states are studied in this paper. The results show that the properties of higher-order squeezing of the two states exclude each other, and characteristic functions and Wigner functions are all not gaussian. Particularly, Wigner functions can not be perseved positive define. Quasiprobability density (QPD) of the two states are neither "elliptic" nor "crescent", but are two-petal-like shape, which shows that squeezing type can not be represented by the QPD figure of a state.
SOLUTIONS AND CHARACTERS OF THE THERMAL-INSEN-SITIVE RESONATOR
Authors: ZHANG GUANG-YIN  ,   南开大学物理系,天津,300071
Published: November 2020

In this paper the transformation-circle diagrammatic approach is developed. Using this method, the general solution of the thermal-insensitive resonator is derived, that is, the σ1 circle is tangential to the πf circle. Its main characters arc elucidated clearly. Some inaccurate current points of view on its characters are made clear. Furthermore, the special solution of the optimal thermal-insensitive resonator is obtained, that is, g1*g2*=1/2; L2= 0 or L2=R2.
INFLUENCE OF DOPING BY TRACE Cu OR Mn IN SINTERING PROCESS ON STRUCTURAL TRANSFORMATIONS OF ZnS ELECTROLUMINESCENT PHOSPHOR
Authors: LI BI-LIN  , GUO CHANG-XIN  , WAN YUE-TING  ,   (1)中国科学技术大学结构分析开放研究实验室,合肥,230026; (2)中国科学技术大学物理系,合肥,230026
Published: November 2020

The structures of a family of pure ZnS and ZnS eloped by activator Cu and Mn with different concentration ranges under sintering temperature ranging from 600℃ to 1200℃ have been investigated by x-ray powder diffraction method. Using the absolute standard method, the weight ratio of a phase to 3 phase of ZnS microcrystal and the constant Kβα of this method have been determined. The results show that the transition temperature of low temperature βphase to high temperature α phase is 1020℃ for pure ZnS, as generally accepted. When the concentration of doped Cu is in excess of 1×10-3, the phase trasition temperature (PTT) moves obviously to high temperature. As the concentration of Cu reaches 2×10-3, the PTT is higher than 1200℃. The results can be explained by postulating when the concentration of Cu is greater than the solubility of Cu in ZnS, a separate phase of copper sulfide serves as a nucleating phase for the growth of cubic ZnS and thus promotes the hexagonal-to-cubic transition. When the concentration of doped Mn is in excess of 1×10-3, the PTT moves obviously to low temperature. As the concentration of Mn reaches 5×13-3, the PTT is lowered to 730℃. In the range from 700℃ to 950℃, the weights of α phase and βphase are close to each other. The PTT of ZnS: Cu 2×10-3. Mn 5×10-3 are also determined approximately as 1100℃.
NONLINEAR CONNECTION, BELTRAMI CONNECTION AND TWO-DIMENSION GRAVITY
Authors: WANG SHI-KUN  , WANG ZHONG-HUA  , WU KE  , GUO HAN-YING  ,   (1)中国科学院理论物理研究所,北京,100080; (2)中国科学院应用数学研究所,北京,100080
Published: November 2020

In terms of the theory of nonlinear connection, we proposed the concept of Beltrami connection in two dimension space, and discussed the symmety of Polyakov's two dimension gravty.
HEAVY-ION BACKSCATTERING——A NEW METHOD FOR DETERMINATION OF TRACE HEAVY ELEMENTS ON THE SURFACE AND NEAR SURFACE
Authors: CHENG HUAN-SHENG  , YANG FU-JIA  , LI XIANG-YANG  ,   复旦大学物理二系,上海,200433
Published: November 2020

We describe a new technique for MeV heavy-ion backscattering analysis of trace heavy elements on the surface and near surface. Pulse pileup problems are eliminated by choice of incidence ion mass M1, which is the same as or larger then that of bulk atom M2. Using 3 MeV Si beam, we could measure quantities of arsenic implanted in silicon down to 2×1012 atoms/cm2. Experimental results also show that sensitivity for impurity element on silicon substrate is as high as 2.2 ×109 atoms/cm2 for Au.
CALCULATION OF l-MIXING CROSS SECTION IN THERMAL COLLISION OF RYDBERG STATE Na ATOM WITH RARE GAS
Authors: LIU HONG  , CHEN AI-QIU  , LI BAI-WEN  ,   中国科学院武汉物理研究所波谱与原子分子物理开放研究实验室,武汉,430071
Published: November 2020

On the basis of impulse approximate method, an analytical wavefuction based on a potential model was used to calculate the l-mixing transition cross section of Rydberg state Na atom in thermal collision with He, Ne and Ar, the results for Na-He are better than that of other methods ever used.
ABNORMAL CHANGES IN SERS OF SALICYLIC ACID ADSORBED ON COLLOIDAL SILVER AFTER ADDING KC1
Authors: FANG YAN  , FU SHI-YOU  , ZHANG PENG-XIANG  , YU YONG-CHENG  ,   (1)北京师范学院实验中心,北京,100037; (2)中国科学院物理研究所,北京,100080
Published: November 2020

The abnormal changes in SERS of salicylic acid adsorbed on colloidal silver caused by adding KC1 are reported in this article. It was found that the SERS of some vibrational modes corresponsing to certain structures in salicylic acid were reduced rapidly. However, only the SERS intensity of v(-OH) vibration near 3436cm-1 incresed further because of KC1 addition. Also the influence of adding KC1 on SERS signals of a series of molecules including -COOH structure such as p-aminobenzoic acid, benzoic acid etc., were investigated. It was shown that Cl- could obviously weaken the SERS intensity of those molecules adsorbed on silver colloid. Both the phenomena have been discussed, and were compared with the case of pyriline. The results of transmission electron micriscopy observation and UV-visible spectral. experiments showed the agreement with the above conclusion.
CRYSTAL STRUCTURE AND FERROELASTIC DOMAIN OF PrP5O14
Authors: LIU SHU-ZHEN  , HONG GUANG-YAN  , HU NING-HAI  ,   中国科学院长春应用化学研究所,长春,130022
Published: November 2020

The crystal stucture and phase transition of PrP5O14 have been studied by X-ray diffraction methode. The crystal belongs to monoclinic system at room temperature. The structure parameters are as follows: a = 8.777(l)?, b = 9.029(2)?, c= 13.068(2)?, β=90.35°(l), z=4. The space group is P21/c. The final R is 0.046. The monoclinic system transforms to an orthor-hombic phase at 130±5℃. The point-group changes from 2/m to mmm. The monoclinic system contains mmmF2/m ferroelastic domain. The lattice parameters with orthorhombic phase are a = 8.813(7)?, b = 9.075(2)?, c = 13.119(10)?. The space group is Pncm. Finally, the relationship between the crystal structure and ferroelastic behavior are discussed.
STUDY OF THE EFFECTS OF THE LIGHT INTENSITY AND TEMPERATURE ON THE FREQUENCY OF THE Rb MASER
Authors: Xiang Yuan-hai  , Zhu Xi-wen  , Deng Jin-quan  , Tan Yong-fang  ,   中国科学院武汉物理研究所波谱与原子分子物理开放研究实验室,武汉,430071
Published: November 2020

We studied the effects of the light intensity and temperature on the frequency of the Rb maser experimentally, and satisfactorily explained the changes of the light-independent frequency setting (LIFS) of the cavity and of maser frequency at LIFS under various cell temperatures. We presented a feasible method by which the effects of temperature and light intensity on maser frequency could concurrently be reduced.
A STUDY ON MICROSTRUCTURE OF PHASE TRANSITION IN A LIQUID CRYSTAL
Authors: Yin Chuan-yuan  , Sun Zheng-min  , Shen De-xun  ,   (1)南京大学固体微结构物理实验室; (2)南京大学物理系,南京,210008
Published: November 2020

The positron lifetime and DSC measurements for EBBA have been made with heating and cooling clycles. The experimental results show that the shorter lifetime (τs) is essentially independent of temperature while the longer lifetime (τ1) and the intensity (I1) change abruptly twice with temperature. These two critical temperatures are in accordance with "he transition temperature measured by the DSC. In the heating and cooling clycles the transition temperature are different. The changes in microstructure during the phase transition have been explained by the ORE model of positron annihilation, which raised the idea that positron can be a probe in the study of EBBA phase tyansitioa
FORMATION OF Pd-Ni-P SUPERSATURATED SOLID SOLUTION UNDER HIGH PRESSURE
Authors: Xu Ying-fan  , Huang Xin-ming  , Chen Hong  , Wang Wen-kui  ,   (1)中国科学院国际材料物理中心,沈阳,110015; (2)中国科学院物理研究所,北京,100080
Published: November 2020

This paper reports the results of crystallization of bulk metallic glassy sphere of Pd40Ni40P20 (with diameter range from 0.1 to 1.0 mm) under 4GPa pressure. Compared with the result obtained at ambient pressure, the crystallization temperature of the glass increased with pressure at the rate of 15K/GPa. As annealing temperature under pressure closed to the melting temperature of the sample, the single supersaturated solid solution phase with f.c.c. structure was obtained. The same phase was also obtained by annealing a cast Pd40Ni40P20 alloy under high pressure. This result indicates that the new phase is a high pressure phase.
ENERGY-BAND CALCULATION OF UNSTABLE LATTICE
Authors: Tong Guo-ping  , Zhao Hua  , Liu Jing-nan  , Sun Xin  ,   (1)复旦大学物理系,上海,200433;浙江师范大学物理系,金华,321004; (2)南京大学固体微结构物理实验室,南京,210008复旦大学物理系,上海,200433; (3)中国科学技术大学结构分析开放研究实验室,合肥,230026;华东化工学院,华东物理研究所,上海,200237; (4)中国科学院上海技术物理研究所红外物理开放研究实验室,上海,200083;复旦大学物理系,上海,200433
Published: November 2020

It is needed to improve the tight-binding SSH model which is used to describe the conducting polymers, since the conducting polymers are the systems with wide energy band. In order to study one-dimensional lattice instability of conducting polymers more precisely, it is necessary to go beyond the tight-binding approximation. In this paper the Wannier function method used in stable lattice is extended to calculate the electron energy band of insta-ble lattice. The numerical results show that our method has good convergence, the accuracy can be better than 1% when the third neighbor is included. Meanwhile the dimerization caused by the lattice instability can also be determined precisely.
MAGNETIC AND MAGNETO-OPTICAL PROPERTIES OF THE MnBi THIN FILMS DOPED WITH Nd
Authors: Fang Rui-yi  , Dai Dao-sheng  , Sun Yun-xi  , Li Dong-lei  , Liu Ming-sheng  , Yang Dan-kun  ,   北京大学物理系,北京,100871
Published: November 2020

In this paper the structure, magnetic and magneto-optical properties of the Nd-doped MnBi thin films are discussed. The analyses by the Auger profile and X-ray diffraction of these films show that the crystal structure composed mainly of MnBi hop is formed after suitable annealing, and the structure of MnBiNd alloy which is much similar to the MnBi may be existed for the MnBi films doped with Nd. According to the crystal structure with NiAs type the lattice constants of MnBiNd alloy are calculated: a = 4.14?, c = 5.80?. The torque curve and the hysteresis loop show that the film possesses perpendicular anisotropy. When the ratio of raw materials Mn/Bi is two or so, we can obtain the suitable σs, the proper Hc(1-4 kOe), and a very large Kerr rotation angle θK (1.5-2°). The magneto-optical profile shows that the frequency corresponding to the maximum θK shifts to low frequency as Nd component increases .It was found that the grain size of all films which were deposited on the cooled glass substrates is limited in the range of 200 to 400?, moreover, the high temperature phase transition of MnBi alloy was avoided by Nd doping.
MSSBAUER STUDY OF NANOCRYSTALLINE SnO2 MATERIALS
Authors: Zhang Dao-yuan  , Wang Da-zhi  , Wang Gen-miao  , Wang Zheng  , Wu Yong-hua  ,   (1)中国科学技术大学材料科学与工程系; (2)中国科学技术大学基础物理中心; (3)中国科学技术大学结构分析开放研究实验室; (4)中国科学技术大学物理系,合肥,230026
Published: November 2020

X-ray diffraction, transmission electron microscopy and Mossbauer spectroscopy were used to verify nanocrystalline state of the SnO2 materials prepared by hydrothermal growth, The hyperfine parameters of Sn atom and relation between it and temperature have been measured by Mossbauer spectroscopy. It has been revealed that nanocrystalline SnO2 will cover to crystalline SnO2 at 600℃.
EVOLUTION OF HYDROGEN (DEUTERIUM) IN PALLADUIM HYDROGEN (DEUTERIUM) SYSTEM AND THE DISTRIBUTION OF HYDROGEN NEAR THE SURFACE
Authors: QIN GUO-GANG  , PENG QING-ZHI  , FU JI-SHI  , ZHANG LI-ZHU  , ZHANG BO-RUI  ,   (1)北京大学物理系,北京,100871; (2)中国科学院国际材料物理中心,沈阳,110015
Published: November 2020

Hydrogen and deulerium have been introduced into palladuim cathods in an electrolysis process for 150 h with light and heavy water as electrolyte respectively. The palladuim cathods used had quenched or annealed after a thermal treatment at 950℃. The variation of diffraction pattern and lattice constant of β phase of palladuim-hydrogen system in air with time have been measured by X ray diffraction method. The distribution of hydrogen in the surface layer of palladuim-hydrogen system bas been measured by the nuclear reaction1H(19F,αγ)16O. Comparing a quenched palladuim cathod with annealed palladuim cathod, it is shown that the former has higher initial concentration of hydrogen and faster evolution velocity than the latter after the electrolysis. The concentration of hydrogen arrives its maximum at the surface of palladuim hydrogen system and its minimum at a depth of several hundred angstroms from the surface.
RAMAN SCATTERING STUDIES OF MBE-GROWN GaAs/Si
Authors: HU FU-YI  , LI AI-ZHEN  ,   中国科学院上海冶金研究所,上海,200030
Published: November 2020

The origin, profiling and interaction of biaxial compressive and tensile stresses in unan-nealed MBE grown GaAs/Si along the growth direction for thickness range of 500?-4.2μm has been studied by Raman Scattering Spectroscopy measurement. The shift asymmetry of the LO phonon peak was investigated in detail.
LOW TEMPERATURE STABLE PHASES OF HIGH Tc SUPERCONDUCTOR YBa2Cu3Oz
Authors: WANG QIANG  , ZHANG XIAO-WEN  , GU BING-LIN  , TANG XIAO-FENG  ,   (1)清华大学材料科学与工程系,北京,100084; (2)清华大学现代应用物理系,北京,100084
Published: November 2020

Based on eight-point cluster variation method and introduction of isotropic nearest neighbor interaction and anisotropic next nearest neighbor interactions, the orderdisorder phase transition phenomena of the □-O (□: oxygen vacancy; O: oxygen) system on the copper-oxygen plane between two Ba-layers were studied. Calculation results show that there is not only a superconducting orthohombic phase (I) near z = 7.0, but also a superconducting orthohombic phase (II) near z = 6.5, as well as other metastable phases.
SURFACE GEOMETRY OF A KERR-NUT BLACK HOLE
Authors: QIANG WEN-CHAO  ,   西安冶金建筑学院基础课部,西安710055
Published: November 2020

In this article, the Gaussian curvature of the event horizon of a Kerr-NUT black hole is given. The effect of NUT parameter on the equatorial circumference and the polar circumference of the event horizon is analysed. The problem of embedding the surface in Euclidean 3-space is examined. It is shown that the event horizon of a Kerr-NUT black hole has the geometrical properties which other black holes do not porsess.
THE SOLITON SOLUTIONS OF GENERALIZED KdV EQUATION
Authors: ZHU ZUO-NONG  ,   江苏农学院基础部,扬州225001
Published: November 2020

The generalized KdV equation ut+2μuux+v3x+δu5x=0(μvδ≠0) is studied. Some new soliton solutions of this equation are obtained and some conclusions of Ref [10] are modified.
INFLUENCE OF NON-MAGNETIC IMPURITIES ON THE HIGH-Tc SUPERCONDUCTIVITY
Authors: LI ZHENG-ZHONO  , XIAO MING-WEN  , SHI DA-NING  ,   (1)南京大学物理系,南京,210008; (2)南京航空学院,南京,210016
Published: November 2020

In this paper, we have proved that the non -magnetic doping can also produce pair-breaking effect in the Anderson lattice model of the high-Tc cuprate superconductorts due the energy dependence of the order parameter. In the case of dilute doping, we have obtained a linear decreasing behavior of Tc with the increasing of non-magnetic impurity concentration in agreement with experimental results. Furthermore, we have also calculated the influence of doping on the superconducting energy gap in the density of states. The results indicate that the decreasing of the gap at T = 0 is much slower than the dropping of Tc with the increasing of non-magnetic impurities. Therefore, the gapless region may not appear before the system transforms into the normal state in different from the conventional BCS superconductors with magnetic impurities.
ZERO MOMENTUM BEHAVIOR OF ONE PARTICLE IRREDUC. IBLE DIAGRAMS FOR QUANTUM FIELD THEORY AT FINITE TEMPERATURE
Authors: SHEN JUN  , XU ZAI-XIN  ,   华东师范大学物理系,上海200062
Published: November 2020

By using the closed time-path Green's function method, we investigate the zero momentum behavior of one particle irreducible diagrams for quantum field theory at finite temperature. It is shown that the zero momentum limits of the retarded form of these diagrams are no longer ambiguous provided that the "|p0| prescription", which implies the Kubo-Martin-Schwinger condition, is adopted.