bluuebunny/crossref_metadata_2025 huggingface dataset:
A STUDY OF FORMATION OF CHARACTERISTIC LAYERED INCLUSION IN THE CRYSTAL OF RUBIDIUM ACID PHTHALATE AND THEIR RELATIONSHIP WITH THE STRUCTURE
Authors: HUANG YI-SEN  , ZHAO QING-LAN  ,   中国科学院福建物质结构研究所,福州,350002
Published: November 2020

The formation of characteristic layered inclusions in the single crystal of rubidium acid phthalate (RAP) is discussed in view of the effect of its microscopic structure. That the three types of micro structure channels trap the impurities or other different phase precipitates in solution, via a special pair of the conical planes with the highest growth rate and the fluctuation of the growth conditions in liquor, is the main mechanism of inclusion formation. The above argument is in fair agreement with the experimental results for real crystals.
ELECTRON DIFFRACTION AND HIGH RESOLUTION MICRO-SCOPY STUDY ON INCOMMENSURATE MODULATED STRUCTURE IN Ce1+εFe4B4 ALLOY
Authors: LI LONG  , LI FANG-HUA  , YANG DA-YU  , TIAN LING-HUA  , LIN ZHEN-JIN  ,   (1)北京师范大学物理系,北京,100875; (2)中国高等科学技术中心(世界实验室); (3)中国科学院物理研究所,北京,100080; (4)中国科学院物理研究所,北京,100080,银川市宁夏大学物理系
Published: November 2020

The permanent magnetic alloy Ce1+εFe4B4(ε= 0.1, B-rich phase) is studied by means of electron diffraction and high resolution electron microscopy. It has been determined that the Ce1+εFe4B4 alloy has a one-dimensional incommensurate modulated structure of Chimney-Ladder type consisting of two overlapped substructures fomed by Ce atoms and Fe-B clusters respectively. The unit cell parameters of Ce substructure are a = 7.08?, cCe= 3.51-3.60?, and the possible space groups are I4,I4,I4mm, I4/m, I4/mmm. The unit cell parameters of Fe-B substructure are a = 7.08?, cFe= 3.91?, and the space group is P/42/mcm. All of the major and satellite diffraction spots are indexed by using of four indexes method. The high resolution electron microscopic image shows contrast modulation bands corresponding to the modulated structure. The fluctuation of the period of Ce substructure has been observed and discussed. The orientational anormaly caused by the possible deviation of Ce atomic planes from the (a, b) plane is also discused.
RESEARCH OF UNDERCOOLING AND FORMATION OF BULK METALLIC GLASS OF Pd-Ni-P SYSTEM IN A CONTAINERLESS PROCESSING
Authors: Xü YING-FAN  , SUN GUO-XIAN  , CHEN HONG  , WANG WEN-KUI  ,   中国科学院物理研究所,北京,100080
Published: November 2020

Undercooling experiments of Pd43.5Ni43.5P13 and Pd40Ni40P20 alloys were performed in a 1.2 m drop tube. The effect of cooling rates on the glass formation, nucleation and crystal growth of the Pd40Ni40P20, alloy was studied by filling the various inert gas in the tube. The critical cooling rate for the glass formation in the tube was determined. In addition, it is indicated that the initial temperature of the drop before it droped down is related closely to the nucleation and crystal growth of the alloy.
A STUDY ON THE PHYSICAL PROCESS OF INDIUM IMPLANTATION BY PULSE LASER AND THE DEFECT PROPERTIES IN n TYPE SILICON
Authors: LIU KAI-FENG  , CAI JING  , SUN HENG-HUI  , RUN YUN-ZHU  , CAO YONG-MING  ,   (1)复旦大学材料科学系,上海,200433; (2)复旦大学物理系,上海,200433
Published: November 2020

In this paper, implantation of indium atoms into silicon forming pn juction by Nd-YAG pulse laser irradiation was reported. The indium depth profile in silicon has been determined by secondary ion mass spectrscopy (SIMS) and Rutherford backscatting spectroscopy (RBS). The results can be ascribed to a qualitative model for the physical process of implantation indium in 20ns pulse laser irradiation. Namely, if the laser energy density exceeds a certain threshold, there exist two parts at the surface layer of silicon, silicon-indium molten mixture and liquid state silicon. But only the liquid state silicon layer exists at the surface if the laser energy density does not reach that threshold. The pn juction has good properties revealed by means of I-V and C-V measurements. The results of deep level transient spectroscopy (DLTS) show that there are two kinds of defects in pn juction. One kind of the defects (E1) disappears at 600℃, 60s in rapid thermal annealing (RTA) and the study shows that the defect E1 may be the impurity-vacancy complex. The other defects E2 would not disappear in RTA and may be related to the dislocations.
TEST PARTICLE DIFFUSION ACROSS A SINGLE ISLAND IN A TOKAMAK
Authors: ZHENG SHAO-BAI  , A. J. WOOTTON  ,   (1)Fusion Research Center,University of Texas at Austin,V. S. A.; (2)中国科学院物理研究所,北京,100080
Published: November 2020

In this paper, the phenomena of a test particle diffusion near a single magnetic island in a Tokamak is investigated by the method of Monte Carlo and an effective diffusion time is used to describe the effect of diffusion by the island quantitatively. The results show that there is a uniform function between effective diffusion time and a value called collision raie. The relationsipe between the effective diffusion time and the collision rate and the particle density distribution inside and near the islnad are calculated.
STUDY ON LOW ENERGY ION BEAM NITRIDATION OF Si BY HIGH RESOLUTION CHANNELING-BACKSCATTERING
Authors: ZHU DE-ZHANG  , PAN HAO-CHANG  , CAO JIAN-QING  , ZHU FU-YING  , CHEN GUO-MING  , CHEN GUO-LIANG  , YANG JIE  , ZOU SHI-CHANG  ,   (1)中国科学院上海冶金研究所,上海,200050; (2)中国科学院上海原子核研究所,上海,201800
Published: November 2020

Low energy ion beam nitridation of silicon has been investigated by high resolution channeling-backscattering technique. The profiles of nitrogen and displaced silicon atoms are obtained, During the bombardment, all the three processes of implanting, sputtering and releasing exist. A differential equation is deduced and the mechanism of formation of silicon nitride is discussed.
A STUDY ON CONDUCTANCE AND STRUCTURE OF MONTMORILLONITE SOLID ELECTROLYTES
Authors: YUAN WANG-ZHI  , LI WEN-HUI  , YUAN WANG-XI  , WANG DA-ZHI  ,   (1)贵州工学院基础部,贵阳,550003; (2)南京铁路运输学校,南京,210037; (3)中国科学技术大学,合肥,230026
Published: November 2020

The ionic conductance of series of montmorillonite which have different submicroscopic structure have been studied after seperating from associated minerals. The absorption bands at 915cm-1 and 840cm-1 in the IR spectra and the resonance with g≈4.3 in the ESR spectra vary with the submicroscopic structure. The influence of the structure on the conductance of the montmorillonites have been discussed.
THE "IRREVERSIBILITY LINE" OF FLUORINE-DOPING Bi1.7Pb0.3Sr2Ca2Cu3Oy BULK SUPERCONDUCTOR
Authors: CAO XIAO-WEN  , FENG SHANG-SHEN  , GAO XIAO-HUI  , JIANG SHU-FEN  , WEI QIN  ,   (1)中国科学院等离子体物理研究所,合肥,230031; (2)中南工业大学,长沙,410083
Published: November 2020

The "irreversibility line" of high Tc fluorine-doping Bi(Pb)SrCaCuO(F) bulk superconductor has been studied experimentally. It is shown that there are different H*∝(l-t)3/2 relations in various regions of magnetic fields, namely, H*=1590(1-t)3/2 in the field region below 120 Oe and H*= 35700(1-t)3/2 -2480 in the region above 120 Oe. We think that the irreversibility lines in low field and in high field represent the behaviour of weak link and the grain superconductivity respectively. We note that H*(T) is substantially a melting line of the flux lattice. It is in the vortex lattice state below the "irreversibility line" H*(T) and in the vortex liquid state between H*(T) and H(c2) (T) curves.
BOUND STATES OF THE DIRAC EQUATIONS WITH HULTHéN-TYPE POTENTIALS
Authors: HU SI-ZHU  , SU RU-KENG  ,   复旦大学物理系,上海,200433
Published: November 2020

The exact solutions of bound states of Dirac equation with one-dimensional vector and scalar Hulthén-type potential are obtained. For three-dimensional Hulthén-type potential, the S-wave exact solutions of Dirac equations are also presented provided the scalar potential is equal to the vector potential.
SOLITON EXITATION IN ONE-DIMENSIONAL QUANTUMb LATTICE GAS
Authors: CHEN CHUAN-YU  ,   广州师范学院物理系,广州,510400;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

In this paper, the non-linear properties of the nearest neighbor interaction between particles in one-dimensional quantum lattice gas are investigated, giving out the soliton theory of the model. The expressions of the solitons' energy and the effective soliton mass are also derived.
SCALAR QUANTUM ELECTRODYNAMICS WITH CHERN-SIMONS TERM IN (2+1) DIMENSIONS
Authors: NI GUANG-JIONG  , XU JIAN-JUN  ,   复旦大学物理系,上海,200433
Published: November 2020

By using a convenient perturbative expansion method, a scalar field φ in scalar QED with Chern-Simons term is quantized. Under the approximation oi one-loop diagram, we have derived the effective action for vector field Aμ and obtained two branches of (unstable) elementary excitation spectra. The coupling coefficient of Chern-Simons term is not affected by the quantization of φ field.
EXACT SOLUTION OF IRREVERSIBLE AGGREGATION EQUATION RELATED TO n-POLYMER
Authors: XUE YU  , KONG LING-JIANG  , CHEN GUANG-ZHI  ,   广西师范大学物理系,桂林,541001
Published: November 2020

In this paper, we investigate the solution of the generlized Smoluchovski equation related to w-polymer. The exact solution of this equation with kernel K(i1,i2,…,in)=const and K(i1,i2,…,in)=sumfrom i=1 to n(il) il are discussed for monodisperse condition. we obtain their explict expressions of the size distrbution C(t), respectively. In addition, we discuss their long term behaviors.
CALCULATIONS OF ENERGY LEVELS AND OSCILLATOR STRENGTHS FOR RuXIV ION
Authors: YUAN XIANG-JIN  , DONG CHEN-ZHONG  , YU GENG-SUN  ,   西北师范大学物理系,兰州,730070
Published: November 2020

The energy levels of 4s24p, 4s4p2, 4s24d and 4p3 configurations and the electric, dipoie oscillator strengths of 4s24p-4s4p2, 4s24p-4s24d and 4s4p2-4p3 transitions ia RuXIV ion have been calculated by means of the configuration interaction (CI) theory and the parameter extrapolation method. The calculated energy levels of 4s24p, and 4s4p2 configurations are in good agreement with the observations, the energy levels of 4s24d and 4p3 configurations and the wavelengths and oscillator strengths of 4s24p-4s24d and 4s4p2-4p3 transitions are only theoretical values of prediction.
62D TRANSFER CROSS SECTION IN RUBIDIUM INDUCED IN COLLISIONS WITH GROUND STATE Rb ATOMS AND H2 MOLECULES
Authors: LIU ZI-DONG  , SUN XIAN-FING  , LI SEN-LIN  , LIU ZHI-YUAN  , ZENG XIAO-YUN  ,   中国科学院武汉物理研究所,武汉,430071
Published: November 2020

Cross sections for 62D in Rb, induced by collisions with ground state Rb atoms and H2 molecules, have been measured using fluorescence methods. The results show that transfer cross sections for Rb(62D)-Rb(52S) are σfs = 67×10-14cm2, σtr = 4.3 ×10-14cm2 and transfer cross section for Rb(62D)-H2 are σfs*=0.44×10-14cm2,σtr*=0.01×10-14cm2.
THE POSSIBILITY OF THE EXISTENCE OF ORGANIC SUPERCONDUCTIVITY
Authors: HU CHENG-ZHENG  ,   武汉大学物理系,武汉,430072
Published: November 2020

In this article, we discuss two important problems about possible superconductivity in organic molecules. One problem concerns the instability of an one-dimensional metal (Peierls distortion). The other is associated with screening of the Coulomb interaction between electrons in organic molecules. First, using Bloch function to describe electronic states, we have shown that some screening of the Coulomb field in organic molecules must occur. The square of screening length is inversely proportional to the density of states at the Fermi level. Next, we have found that for polyacenacene the regular structure is stable with respect to the Peierls distortion, and that bond alternation does not happen. Moreover, polyacenacene has large density of states at the Fermi level, which makes the effective interaction attractive, and the presence of polarizable substituents superconductivity will be possible if other requirements are met.
STRUCTURAL CHANGES IN AMORPHOUS Pd80Si20 AND Pd77.5Cu6Si16.5 ALLOYS CAUSED BY NEUTRON IRRADIATION
Authors: WU ZI-QIANG  , WU GUO-AN  , XIAO KE-QIN  , DONG YUAN-DA  , HE YI-ZHEN  ,   (1)西南反应堆工程研究设计院,成都,610005; (2)中国科学院固体物理研究所,合肥,230031
Published: November 2020

The present work is to study effects of neutron irradiation on the structure of amorphous Pd80Si20 and Pd77.5Cu6Si16.5 alloys by using X-ray diffraction techniques, differential scanning calorimertry (DSC) and internal friction measurements. The irradiation appeared to produce obvious changes in the pair correlation function g(r) and radial distribution function RDF (r). The increases of crystallization temperature (Tx) and enthalpies of two specimens were found by DSC measurements after irradiation. The results of internal friction measurement show that the internal friction of the irradiated Pd80Si20 alloy is higher than that of the unirradiated in the temperature range of Tp. The structure changes before and after neutron irradiation are discussed in terms of the concepts of density fluctuation defects (p) and shear stress fluctuation defects (τ).
JAHN-TELLER EFFECT AND THE STRUCTURAL PHASE TRANSITIONS IN LiNbO3(III)
Authors: WU JIAN-BIN  , WANG ZHI-CHENG  ,   (1)上海交通大学应用物理系,上海,200030; (2)浙江大学物理系,杭州,310027
Published: November 2020

In this paper, the ferroelectric couplings in LiNbO3 have been studied by raking account of the Jahn-Teller effect of NbO6-octahedra. Based on the pseudo-spin model, we qualitatively interpret the 10 phase transitions in LiNbO3 in the temperature range of 290-1221℃.
LIOUVILLE EQUATION OF RELATIVISTIC CHARGED FERMION
Authors: WANG REN-CHUAN  , ZHU DONG-PEI  , WONG CHEUK-YIN  , KO CHE-MING  ,   (1)美国德州A&M大学物理系回旋加速器研究所与理论物理中心; (2)美国橡树岭国家实验室; (3)中国科学技术大学近代物理系; (4)中国科学技术大学天体物理中心,合肥,230026
Published: November 2020

As a form of density matrix, the Wigner function is the distribution in quantum phase space. It is a 2×2 matrix function when one uses it to describe the non-relativistic fermion. While describing the relativistic fermion, it is usually represented by 4×4 matrix function. In this paper we obtain a Wigner function for the relativistic fermion in the form of 2×2 matrix, and the Liouville equation satisfied by the Wigner function. This equation is equivalent to the Dirac equation of charged fermion in QED. Our equation is also equivalent to the Dirac equation in the Walecka model applied to the intermediate energy nuclear collision while the nucleon is coupled to the vector meson only (or taking mean field approximation for the scalar meson). We prove that our 2×2 Wigner function completely describes the quantum system just the same as the relativistic fermion wave function. All the information about the observables can be obtained with our Wigner function.
SCATTERING OF ELECTRONS BY COULOMB POTENTIAL UNDER A STRONG LASER FIELD AND MULTIPHOTON PROCESSES
Authors: LI JIE-PING  ,   北京师范大学低能核物理研究所,北京,100875
Published: November 2020

By introducing dressed potential and Floquet partial wave expansion of the wave functions, the Schr?dinger equation is made separable. In case of strong laser field, the radial wave equations can be solved step by step approximately through the weak coupling method in which an appropriate perturbation term is selected. As an example, with a circularly polarized laser field, the scattering wave function, S-matrix and the cross section are obtained. Important conclusions are: multiphoton processes will appear under strong laser field; m-th multi-photon processes must be connected with a corresponding class of resonance lines with energy near m?w. The formula of line intensity is also obtained.
DIFFRACTION AND INTERFERENCE EFFECT OF DOUBLE GRATINGS WITH A ROTATION-ANGLE UNDER PARTIALLY COHERENT ILLUMINATION
Authors: TU JIN-HONG  , ZHAN LI  ,   上海交通大学应用物理系,上海,200030
Published: November 2020

In this paper, the diffraction and interference effect of double gratings with a rotation-angle under partially coherent illumination is studied, it is a generalization of Lau- Talbo-Moire effect. A general analytic expression of light intensity distribution at the observation plane is obtained by means of ambiguity function method. Some special cases are discussed and verified by experiments.
IMPROVEMENT OF DIFFRACTION EFFICIENCY OF PHASE GRATING RECORDED IN Fe-LiNbO3 Crystal
Authors: XU JING-JUN  , LIU SI-MIN  , WU YUAN-QING  , ZHANG GUANG-YIN  ,   南开大学物理系,天津,300071
Published: November 2020

This paper presents the diffraction efficiency of two-wave mixing in Fe-LiNbO3 (up to-76%) through low frequency modulating one light beam, which is twice greater than the diffraction efficiency (30%) without modulation. Our theoretical analysis of moving grating is. used to explain the experimental results.
A STUDY OF ULTRAFAST RELAXATION PROCESSES IN CS2 BY LASER FREQUENCY DOMAIN METHOD
Authors: FEI HAO-SHENG  , CHEN XIAO-HUI  , HAN LI  , ZHAO JIA-LONG  ,   (1)吉林大学物理系,长春,130023; (2)吉林大学物理系,长春,130023;沈阳建筑工程学院; (3)吉林大学物理系,长春,130023;中国科学院长春物理研究所
Published: November 2020

The dynamic processes of ultrashort Kerr effect in CS2 have been studied by laser frequency domain method. It is found that there are two kinds of relaxation processes which are lps and 0.lps respectively. The physical mechanism is discussed in this paper.
INFLUENCE OF ELECTRON-ELECTRON CORRELATION ON THE JAHN-TELLER-TYPE STRUCTURAL PHASE TRANSITIONS
Authors: WU JIAN-BI  ,   浙江大学物理系,杭州,310027
Published: November 2020

Starting from the Hamiltonian of Jahn-Teller effects and electron-electron correlation, we have studied the influence of electron correlation on the structural phase transitions due to the Jahn-Teller effects. By choosing different values of the parameters in the Hamiltonian, we concluded that there exist three possibilities as follows: (1) The system posesses only one structural phase transition, which corresponds to the symmetry breaking. (2) The system has a symmetry-breaking phase transition at high temperature, while the broken symmetry will be revived by decreasing the temperature. (3) The system has no phase transition throughout the whole temperature range.
KINETICS OF SECOND PHASE Ba6Ti17O40 FORMATION
Authors: HU JIN-YUAN  ,   华中理工大学机械工程二系,武汉,430074
Published: November 2020

Kinetics of second phase Ba6Ti17O40 formation in the mixture of BaTiO3 and excess TiO2 were studied by high-temperature X-ray diffraction method. The reaction curves were obtained at various temperatures for the formation of Ti-rich phase Ba6Ti17O40, and the reaction rate constant K and the activation energy Q were calculated. Finally, the mechanism of second phase Ba6Ti17O40 formation and the effect of excess TiO2 are discussed.
STUDY ON WETTING TRANSITION IN MIXTURE FLUIDS——(I) BINARG SGSTEMS AT TWO PHASE COEXISTENCE
Authors: SONG YAN  , DING E-JIANG  , HUANG ZU-QIA  ,   北京师范大学低能核物理研究所,北京,100875
Published: November 2020

The wetting transition in binary Sullivan systems at two phase coexistence has been studied analytically. The results show that the order of the wetting transition is sensitively dependent on the details of the model. The present method can be used conveniently to study the wetting transition in binary Sullivan systems at multiphase coexistence.
XPS STUDY OF Cu PRECIPITATIONS AT THE SURFACE OF CRYSTALLINE Cu-Zr ALLOYS AFTER ANNEALING IN HYDROGEN
Authors: YU XIN-NAN  ,   中国科学院物理研究所,北京,100080
Published: November 2020

Crystalline Cu-Zr alloys of various composition were annealed (200-400℃) in ultra-high vacuum and in hydrogen, and their surface composition was analyzed by X-ray photoelec-tron spectroscopy. Contrary to the mostly observed oxygen induced surface segregation of Zr we found strong Cu segregation after annealing Cu-rich sample in hydrogen atmosphere. Scanning electron micrographs show surface Cu precipitates, apparently formed due to the effect of the heat of chemisorption of hydrogen on Cu.
EFFECT OF QUADRUPOLAR NUCLEI ON THE RELAXATION IN AX SYSTEM BY RAMAN MAGNETIC RESONANCE
Authors: YANG DAI-WEN  , YE CHAO-HUI  ,   中国科学院武汉物理研究所波谱与原子分子物理实验室,武汉,430071
Published: November 2020

Multiple Quantum (MQ) relaxation times of carbon-proton spin coupling system in chlo-roform(CHCl3), where the scalar relaxation mechanism of the second kind dominates the relaxation processes, were measured via their relevant MQ line widths in One Dimensional (ID) MQ Raman Magnetic Resonance(RMR). The cross correlation coefficient between carbon and proton spins and their coupling constants to the chlorine spin as well as their relative sign were deduced.
BREAKDOWN CHARACTERISTICS OF RAPID THERMAL NITRIDED SiO2 FILM OF 150? THICKNESS
Authors: LIU ZHI-HONG  , CHEN PU-SHENG  , LIU BAI-YONG  , CHENG YAO-ZONG  ,   (1)华南理工大学物理系,广州,510641; (2)香港城市理工学院电子工程系; (3)香港大学电机与电子工程系
Published: November 2020

The silicon dioxide film of thickness 150? with device quality has been nitrided thermally by conventional long time method and high temperature rapid method. For the films breakdown characteristics and endurance under high field were investigated. These results indicate that after nitridation, the distribution of breakdown field strength narrows, its dependence on electrode area decreases, and the maximum breakdown field strength degrades slightly. At the same time, SiO2/Si interface stability under high field and time-dependent dielectric breakdown characteristics are improved by thermal nitridation. The improvement depends strongly oh both the electrode direction of applied gate voltage and nitridation processing condition. According to the mechanism of current transport, we suggest a breakdown model in which charge accumulation, trapping density and position of its center of gravity are all considered.
DETERMINATION OF EVENT HORIZON IN UNIVERSAL STATIONARY SPACE-TIME
Authors: ZHAO ZHENG  , LIU LIAO  ,   北京师范大学物理系,北京,100875
Published: November 2020

A universal method for determining if there exists an event horizon in a stationary space-time and showing its location is given in this paper. It is useful for studying Hawking effect in every static or stationary space-time.
FINITE TEMPERATURE SELF-CONSISTENT SEMICLASSICAL EQUATION AND ITS IMAGINARY TIME STEP SOLUTION
Authors: LI GUO-QIANG  ,   杭州大学物埋系,杭州,310028
Published: November 2020

The finite temperature self-consistent semiclassical equation is derived with the utilization of Skyrme force and semiclassical approximation. This equation is solved numerically by employing the imaginary time step method. The nucleon densities of some hot spherical nuclei are determined and the RMS radii are calculated.
ABSORPTION AND SURFACE ENHANCED RESONANT RAMAN SPECTRA OF RIBOFLAVIN IN SILVER COLLOID
Authors: LIANG ER-JUN  , ZHANG PENG-XIANG  ,   (1)郑州大学分析和测试中心,郑州,450052; (2)中国科学院物理研究所,北京,100080
Published: November 2020

The interaction between riboflavin and silver colloidal particles was studied with absorption and surface enhanced resonant Raman spectroscopy (SERRS). It was found that flourescence interference was completely quenched while Raman scattering was significantly enhanced upon addition of silver sol into ri boflavin aqueous solution. Tentative assignment of Raman modes was given. SERRS sp ectra suggest that Ag complexation of riboflavin in silver sol dose not resemble the aqueous solution complex of Ag. In addition, Raman bands below 1000 cm-1, which are mostly related to ring breathing and C-H torsion out of plane, were also obtained.
EFFECT OF SPACE-CHARGE WAVE IN RAMAN FREE-ELEC-TRON LASERS
Authors: ZHANG SHI-CHANG  ,   电子科技大学物理系,成都,610054;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

By making use of the parametric-amplif ier model, we analyse the effect of space-charge wave in Raman free-electron lasers. R esults show that without taking the initial transverse velocity into account, kwv20>ωc is a necessary condition under which the scattered wave couples with the slow space-charge wave. The dispersion relation and gain of the scattered wave, as well as the matching condition between the scattered wave and the space-charge wave, are derived.
THE EFFECTS OF NITROGEN CONTENT OF a-SiNx:H ON THE INTERFACE PROPERTIES IN a-Si:H/a-SiNx:H SUPERLATTICES
Authors: ZHU MEI-FANG  , ZONG JUN  , ZHANG XIU-ZEN  ,   中国科学技术大学研究生院,北京,100039
Published: November 2020

The effects of nitrogen content on the interfacial properties in a-Si:H/a-SiNx:H superlat-tices have been studies by electroabsorption (EA) photothermal deflection spectroscopy (PDS), photoluminescence (PL) and infrared (IR). The density of interface charges Qs deduced from EA is approximately 1012cm-2. The density of interface states Ni estimated by PDS is ～1011cm-2 which is smaller by a factor of 5 than Qs. The nitrogen content x dependences of Qs, Ni and the relative peak intensity of luminescence Ipl exhibit similar behavior and show extreme values at x=xc which is defined as critical value of nitrigen content. The critical values of nitrogen content are in the x range of 0.85-0.95. The measurements of IR reveal that the absorption of N-H bonds increases rapidly with increasing x in the range of 0.6-1.0. The asymmetry of interfaces and a possible mechanism of presence of critical values are discussed-For interpretating the phenomena observed, a model of charged nitrogen dangling bond is suggested.
ELECTRICAL RESISTIVITY OF THE WEAK-DISPERSION HEAVY-FERMION ALLOY MODEL
Authors: LI ZHENG-ZHONG  , XU WANG  , ZHOU QING-CHUN  ,   南京大学物理系,南京,210008
Published: November 2020

The electrical resistivity of the heavy-fer mion alloy system is calculated through the Yoshimori-Kasai model with the application of the slave-boson technique. The residual resistivity of the system is found in the mean-field approximation by using the CPA method-The low-temperature resistivity maximum in the concentrated alloy is aslo obtained as the Gaussian fluctuation of the slave-boson field is included.
MICROSTRUCTURE OF SiOxNy THIN FILMS AND A NEW MODEL FOR THE CURRENT TRANSPORT MECHANISM
Authors: YANG BING-LIANG  , LIU BAI-YONG  , CHEN DOU-NAN  , Y. C. CHENG  ,   (1)华南理工大学物理系,广州,510641; (2)香港大学
Published: November 2020

The microstructure and current transport behavior in the thermally nitrided silicon oxide (SiOxNy) thin films have been studied and a new model is proposed to explain the current transport behavior of the films. In particular, the model includes the case in which the external applied high field rises up to the value just before the occurance of intrinsic breakdown. The theoretical result of the new model agrees well with the experiment. Finally, the significant current enhancement and trapping ledge phenomenon in the I-V characteristics of the films have been explained satisfactorily using this new model, and the influences of the external applied field and the electron trap on the current transport behavior in the films are also discussed.
MAGNETIC PROPERTIES AND CONVERSION ELECTRON M?SSBAUER SPECTROSCOPY OF COMPOSITIONALLY MODULATED FeBSi/Si AMORPHOUS FILMS
Authors: MEI LIANG-MO  , LI WEI-DONG  , BI SI-YUN  , LIU YI-HUA  ,   山东大学物理系,济南,250100
Published: November 2020

The compositionally modulated FeBSi/Si amorphous films were prepared by rf sputtering. The saturation magnetization of modulated films decreases exponentially with increase of the thickness of Si layers. This is caused by the dead layers. The M?ssbauer spectra measurements showed that the dead layers are the paramagnetic phase formed by the interdiffusion of Fe and Si atoms at the interfaces. The size effect was observed in the FeBSi/Si films. The size effect depends only on the thickness of FeBSi layers, and the dead layer effect depends on both the FeBSi layer thickness and Si layer thickness.
QUANTUM HALL EFFECT AND BERRY PHASE FACTOR
Authors: CHEN CHENG-MING  , ZHANG QUAN  ,   浙江大学物理系,杭州,310027
Published: November 2020

The concept of Berry's phase factor in adiabatic process is generalized to degenerate systems, the relation between the quantum Hall effect and Berry's phase factor is studied. It is shown that the quantum Hall conductance σH is really a special Berry's phase factor, and thus has the same geometrical properties.
NEW SOLITONS IN COUPLED SCALAR FIELD THEORY
Authors: WANG XIN-YI  , ZHAO NAN  ,   苏州大学物理系非线性科学中心,苏州,215006
Published: November 2020

This work presents a simple and effective inethod for obtaining the exact soliton solutions of the coupled relativistic scalar field theory. The exact solutions obtained are new and important. The method suggested here can be applied to other coupled nonlinear systems as well.
THERMAL STRESS IN SLAB LASERS
Authors: GU SHAO-TING  , ZHANG GUO-XUAN  , HUANG GUO-SONG  ,   中国科学院上海光学精密机械研究所,上海,201800
Published: November 2020

The thermal conduction theory based on uniform heating in the slab laser has presented before, but the results obtained from this theory disagree considerably from the results of experiment. In this paper, a non-uniform heating model based on the absorption law of medium is proposed. According to this model, the temperature distribution in the slab laser under CW and pulse pumping is solved. Thermal stress and fracture limitation of the slab are given. The new model is in accordance with the experimental results.
INVESTIGATION OF THE SEMICONDUCTOR STRAINED SUPERLATTICE STRUCTURE AND INTERFACE BY X-RAY ROCKING-CURVE ANALYSIS
Authors: ZHU NAN-CHANG  , LI RUN-SHEN  , XU SHUN-SHENG  ,   中国科学院上海冶金研究所,上海,200050
Published: November 2020

The dynamical theory as developed by Takagi and Taupin for imperfect crystals has been applied to analyse the intensity distribution of the superlattice diffraction peaks, and to compute the rocking curves when the interface grading and the period thickness fluctuation are present. The reason why the interference fringes between the superlattice diffraction peaks disappear and the superlattice diffraction peaks broaden are discussed. It is clear that the intensity distribution of the superlattice diffraction peaks depends on the superlattice period thickness, the composition and strain in it. The interface gradient and the period thickness fluctuation may affect the double-crystal rocking curves. The main reason of the superlattice diffraction peak broadening is the bending of lattice plane.
ANDERSON TRANSITION IN THE AUBRY MODEL OF ONE-DIMENSIONAL INCOMMENSURATE SYSTEMS
Authors: SUN JIN-ZUO  , WANG CHUAN-KUI  ,   (1)北京师范大学物理系,北京,100875; (2)山东省聊城师范学院物理系,聊城,252000
Published: November 2020

Using numerical calculation, it is found that there are extended states, intermadiate states and localized states in the Aubry model of one-dimensional incommensurate systems. The transition from extended states to localized states should pass through a regime in which the intermadiate states exist. The regime is situated at aboubt the potential strength V=2t. The new result is different from that of duality theory which predicts that all states are extended for V2t all states are localized, at V = 2t there exists Anderson transition.
CORRELATION BETWEEN BARRIER PARAMETERS OF Al2O3 TUNNEL JUNCTION AND TOP ELECTRODE METAL
Authors: MA WEN-GAN  , LIN ZHI-RONG  , ZHANG GUI-GEN  , SHU QI-QING  , ZHENG KE-QIN  ,   (1)中国科学技术大学近代物理系,合肥,230026; (2)重庆大学应用物理系,重庆,630000
Published: November 2020

Models of trapezoidal barrier in two extreme cases are used in this paper to study barrier parameters of A1-A12O3-M tunnel junctions, the top electrodes of which are Au, Ag and Cu, respectively. From the fitting calculation of V-I characteristics of the above junctions at 77 K, we find that both models can explain the experimental results very well, and the barrier parameters correlate with the atom radius of top electrode metal, the work function of top electrode metal material and the electron affinity to isolarer medium A12O3, respectively.
STABILITY OF THREE KINDS OF ORDERED STRUCTURES IN A (B0.51B0.52)O3 FERROELECTRICS
Authors: WANG QIAN  , GU BING-LIN  , ZHANG XIAO-WEN  ,   (1)清华大学材料科学与工程系,100084; (2)清华大学现代应用物理系,100084;中国高等科学技术中心世界实验室
Published: November 2020

In A(BB0.51B0.52)O3 perovskite-like ferroelectrics. besides the stable 1/2〈lll〉-typeordered structure, two new kinds oi ordered structures, 1/2〈110〉 and 1/2〈100〉 superlattices, have been observed at room temperature and -150℃ respectively. In this paper, the longrange interactions are introduced into the eight-point cluster variation method to analyse the stabilities of the three kinds of ordered structures. The results are in good agreement with experimental observations.
DEFORMATION THEORY AMONG TRAVELLING WAVE SOLUTIONS OF KdV EQUATION AND HIGH ORDER KdV EQUATIONS
Authors: CHEN DE-FANG  , LOU SEN-YUE  ,   宁波师范学院物理系,宁波,315211
Published: November 2020

By means of some limiting procedures, the solutions of a complex nonlinear equation with many parameters could degenerate into the solutions of a simple equation with less parameters. In this paper, taking KdV equation and high order KdV equations as example, we analyse the possibility of the inverse procedure of the limiting process mentioned above. The results show that deforming a solution of a simple equation into that of the. complex equations is possible. However, this inverse procedure is not unique in general.
MATHEMATICAL STRUCTURE OF THE EIGENSTATES OF OPERATOR ak AND THEIR PROPERTIES
Authors: WANG JI-SUO  ,   聊城师范学院物理系,聊城,252059
Published: November 2020

Based on the reference [1] , the mathematical and quantum statistical properties of the orthonormalized eigenstates of operator αk (k=3) are studied in this paper. It is found that all the orthonormalized eigenstates have nonclassical effects and they form a nonclassical complete representation. The result given by the reference [1] in the case k = 3 is only a special instance of the general conclusion of ours.
NEARLY DEGENERATE FOUR-WAVE MIXING IN PLASMA BY STIMULATED RAMAN SCATTERING
Authors: MA JIN-XIU  , CHEN RONG-QING  , XU ZHI-ZHAN  ,   中国科学院上海光学精密机械研究所,上海,201800
Published: November 2020

This paper studies the nearly degenerate four-wave mixing in plasma which is caused by the electron plasma wave excited via the process of stimulated Raman scattering. The third-order nonlinear susceptibilities of the plasma are derived analytically and the condition to satisfy the phase matching is discussed. The couple-wave equations are solved to obtain the phase conjugate reflectivity. The dependence of the reflectivily on the frequency difference between the pump and the probe beam as well as on the interaction length is studied both analytically and numerically.
THEORETICAL ANALYSIS ON THE INTERNAL FRICTION OF METALLIC GLASSES NEAR Tg
Authors: LI XIAO-GUANG  , HE YI-ZHEN  ,   (1)中国科学技术大学物理系,合肥,230026; (2)中国科学院固体物理研究所,合肥,230031
Published: November 2020

In this paper we analyze and discuss the characteristics of internal friction of metallic glasses near glass transition temperature Tg based on the model of free volume and mechanical theory of solids. The relationship between stress and strain was obtained if the proportion occupied by solid-like and liquid-like regions in the matrix of glassy state was considered. It is found theoretically that the internal friction peak being of relaxation type can appear in the vicinity of Tg and the modulus decrease dramatically during glass transition. The theoretical analysis is essentially in agreement with experimental results.
WORK FUNCTION STUDY OF CO AND K COADSORPTION ON Cu(lll) SURFACE
Authors: LI HAI-YANG  , ZHU LI  , XU YA-BO  , CAI LIAN-ZHEN  ,   浙江大学物理系,杭州,310027
Published: November 2020

Coadsorption of CO and K on Cu(lll) surface was investigated using a Kelvin probe. We found that CO can adsorb (probably dissociatively) on the potassium precovered Cu(lll) surface at room temperature. When θKmin, (θmin = 0.18) the adsorption of CO makes the work function increase. When θK>θmin, the work function decreases at first, and then increases with amount of CO exposure. The results can be well accounted for by the jellium slab model.
MAGNETIC FLUX PINNING AND CREEP IN (BiPb)-Sr-Ca-Cu-O 2223 PHASE HIGH-Tc SUPERCONDUCTOR
Authors: JIN XIN  , ZHANG YI-TONG  , LU MU  , ZHANG CHANG-GUI  , YAN YONG  , YU YANG  , SHEN JIAN-CANG  , YAO XI-XIAN  ,   南京大学物理系,南京,210008
Published: November 2020

The preparing method of (BiPb)-Sr-Ca-Cu-O 2223 phase high-Tc superconductor is introduced. The magnetic relaxation rate dependence on applied magnetic field was measured by using a vibrating sample magnetometer. From the above results, the relationship of activation energy U0 vs. applied magnetic fuild B is discussed. We found that the functional form is U0-B-a in the magnetic field range of 0-0.23 T. The results is similar with that of Pa-lstra based on resistance broadening experiment for single crystals.
SINGLE PHOTON IONIZATION AND FRAGMENTATION OF BENZONITRILE
Authors: Wang Zhen-ya  , W. Kamke  , B. Kamke  , I. V. Hertel  ,   (1)德意志联邦共和国弗赖堡大学物理系; (2)中国科学院安徽光学精密机械研究所,合肥,230031
Published: November 2020

Single photon ionization and fragmentation of benzonitrile is studied using synchrotron radiation. The ionization potential of benzonitrile, and the appearance potentials of spontaneous or prompt and metastable fragment ions for different flight time are measured precisely. Decay curves of metastable fragment ions is also obtained by means of ion energy loss scans spectroscopy.
AN X Ray Diffraction STUDY ON THE ULTRA-HIGH ELECT-ROMECHANICAL ANISOTROPY IN (Pb0.85Sm0.10)(Ti0.98Mn0.02)O3 PIEZOELECTRIC CERAMICS
Authors: ZENG YAN-WEI  , XUE WAN-RONG  , FU GUO-FEI  , ZHOU HENG-NAN  ,   (1)南京大学物理系,南京,210008; (2)南京化工学院硅工系,南京,210009
Published: November 2020

XRD technique was employed to examine Sm-modified PbTiO3 piezoelectric ceramics with typical ultra-high electromechanical anisotropy. By introducing crystal plane orientation density ρ(hkl) and establishing wall translation model for 90°ferroelectric domain switching, a quantitative analysis and discussion on the domain texture change within the ceramic disks poled at various electric forces has been carried out. The results indicate that 90°domain walls in the modified PbTiO3 ceramics show a strong spatial orientation preference, and little changes in their orientation can result from poling treatment but noticeable wall displacement appears. Another noteworthy result is that the thickness electromechanical coupling coefficient Kt develops with poling field almost at the same pace as the orientation density gain △ρ(002) of the crystal plane (002).
STRUCTURE EFFECT OF SPUTTERRED SILICON CLUSTERS STUDIED BY MEANS OF TIME-OF-FLIGHT METHOD
Authors: Liu Shu-rong  , Jiang Wei-lin  , Liu Jia-rui  , Lin Yin-nong  ,   (1)中国科学院物理研究所,北京,100080; (2)中国科学院物理研究所,北京,100080;天津师范大学物理系,天津,300074; (3)中国科学院物理研究所,北京,100080;中国科学院低温技术实验中心,北京,100080
Published: November 2020

A Time-of-Flight Mass Spectrometer was developed by modification of a 200kV Ion Im-planter. The time resolution of the 20keV pulsed Ar beam was greatly improved using a part of rising edge of the scanning voltage.Mass distributions of positive and negative microclusters were measured for monocrysta-lline, polycrystalline and amorphous silicon sa microclusters were measured for monocrysta-mass spectra would be strongly related to the structure of the silicon targets.
THEORETICAL ANALYSIS OF AN RAMAN FREE ELECTRON LASER EXPERIMENT WITHOUT AXIAL MAGNETIC FIELD
Authors: Wang Ping-shan  , Hu Ke-song  , Huang Sun-ren  , Chen Yu-tao  , Fu Shu-zhen  , Hu Jian-ping  ,   应用电子学研究所,成都,610003
Published: November 2020

In this paper, the self-focusing processes and ability of helical wiggler, which is often used in Raman Free Electron Laser experiment,, are analyzed. And the conditions for steady beam transportation are given and compared with the Raman FEL experiment beam data. In addition, the theoretical analysis of EPA-74 FEL radiation is presented, which is in agreement with the experimental results.
MOVING DISLOCATION IN TWO PHASE MEDIUM
Authors: Yang Shun-hua  , Li Guo-wang  , Huang Jun-ping  ,   (1)北京科技大学材料物理系,北京,100083; (2)北京科技大学物理系,北京,100083
Published: November 2020

We consider in this paper a straight dislocation moving uniformly parallel to the planar phase boundary in a two phase medium. We take a moving coordinate system, in which the dislocation is relatively at rest, and extend the general anisotropic elastic theory of dislocation to this coordinate system. We employ the Green function method in elastic theory to treat the phase boundary, thus obtain the total elastic field produced by this moving dislocation and the "image force" acting on it. Our theoretical method is applicable in general, it can be used to consider the interaction between this dislocation and other lattice defects, and mechanical properties of the two phase medium.
THE SOLITON SOLUTIONS OF KdV EQUATION RUNNING TO THE LEFT AND THEIR INTERACTIONS
Authors: LOU SEN-YUE  ,   宁波师范学院物理系,宁波,315211
Published: November 2020

We point out that there exist the soliton solutions of the KdV equation running to the left, as well as static and the interaction solutions between left running and right running solitons. The larger the amplitude of the left running soliton is, the slower it moves.
STUDY OF THE MONOCLINIC PHASE AND EFFECT OF Ba-DOPING IN Bi-Sr-Ca-Cu-O SYSTEM
Authors: Mao Zhi-qiang  , Han Zhi-yi  , Wang Yu  , Yang Li  , Lu Jiang  , Fan Cheng-gao  , Zhou Gui-en  , Chen Zhao-jia  , Zhang Yu-heng  ,   (1)中国高等科学技术中心(世界实验室); (2)中国科学技术大学结构分析开放研究实验室,合肥,230026; (3)中国科学技术大学物理系
Published: November 2020

The sample with the nominal composition Bi2Sr2Ca1-xBaxCu2Oy(A),Bi1.7Pb0.3Sr2Ca2-xBaxCu3Oy(B) were synthesized by solid state reaction. The analyses of phases and structure of the samples showed that a new kind of monoclinic phase exists in Bi-system with cell dimension a=24.84?, b=6.29?, c = 20.70?, β=114.2?. There exists special relation between the monoclinic phase and the superconducting property of Bi system. For 2212 phase, the diamagnetic transition at 95K was observed when the monolinic phase co-existed with 2212 phase, furthermore the addition of Ba ions facilitated the formation of the monoclinic phase. For Ba-doped 2223 phase, the study of electron diffraction indicated that Ba ions got into the 2223 phase and caused the change of crysral micro-structure of 2223 phase, a new additional superstructure appeared along b axis, and two kinds of modulation mode were observed simultaneously along this direction, the wavelength of which is 27?, 43? respectively. The measurement of physical property showed that the zero resistance temperature of the samples can reach as high as 113-114K by proper doping of Ba ions, and the diamagnetic transtion at 118K was also observed. This kind of increasing of the critical temperature of 2223 phase may be related to changes of its crystal microstructure.
GREEN'S FUNCTION APPROACH TO 3-DIMENSIONAL ISING MODEL
Authors: Teng Bao-hua  ,   成都科技大学物理系,成都,610065
Published: November 2020

With the Green's function tequnique, we have exactly dealed with 3-dimesional lsing model, and obtained the linear equations of the ensemble average of the spin which are able TO be recurrent. Then by applying the decoupling approximation to the spin blocks, we can transform the solution of the transition temperature, magnetization and so on into the solution of algebraic equations. We have shown that for the smaller spin block we can obtain the results with higher precision.
POLARIZED RAMAN STUDY OF HD CENTER IN KBr:Pb2+ SINGLE CRYSTAL
Authors: WANG YING-ZONG  , FU KE-DE  ,   陕西师范大学物理系,西安,710062
Published: November 2020

The experimental results of polarized Raman scattering in KBr: Pb2+ single crystal after a long X-irradiation at 77K are reported in this paper. Based on the recently developed Behavior Type analysis method, it is confirmed that the peak at 186 cm-1 in Raman spectrum of KBr: Pb2+ corresponds to the vibration mode A′ of HD center with the symmetry of point group C1k(010).
X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF Fe ION IMPLANTED POLYCRYSTALLINE Al2O3
Authors: LI SHI-PU  , FAN DONG-HUI  , WANG GUO-MEI  , XING NING  , REN WEI  ,   武汉工业大学材料工程系,武汉,430070
Published: November 2020

In this paper, all ionic states in the polycrystalline Al2O3 implanted with Fe ions are studied by X-ray photoelectron spectroscopy. The Gaussian decomposition of spectra is done by computer, and the relative content of various valence of implanted Fe ion is obtained.
OPTICAL ABSORPTION OF THE PYRAZINE-BRIDGED MIXED-VALENCE DIMER
Authors: PENG JING-CUI  ,   湖南大学应用物理系,长沙,410082
Published: November 2020

A many-mode model which contains the intra-structure of pyrazine ring is presented and applied to the Creutz-Taube ion, a pyrazi ne-bridged mixed-valence compound of ruth-enium. In C-T ion, two Ru4dxz obitals are coupled with one π* obital on the pyrazine bridged ligand. They form linear combination which we lable as bonding (B), nonbonding (N), and antibonding (A) combination. Three many-dimensional potential surfaces are constructed. And the optical absorptions are considered as corresponding to transition between related potential surfaces. The results are more close to experimental data.
OBSERVATIONS OF MICROSTRUCTURES OF CRYSTAL SURFACES BY REFLECTION ELECTRON MICROSCOPY
Authors: LI ZONG-QUAN  , SHEN HUI  , QIN YONG  ,   中国科学院固体物理研究所,合肥,230031
Published: November 2020

The surface microstructures of spherical Pt single crystals are studied by reflection electron microscopy, and the defect configurations in the crystals are also analysed. Dislocations and low angle grain boundaries appear in the initial stage of the solidification of liquid drops. In the following annealing, the dislocation density decreases and single crystals are formed owing to the movements of dislocations in the grains to the subgrain boundaries, and those in the subgrain boundaries to the surfaces of crystals.
VUV RADIATION IN COLLISIONS BETWEEN Ar+ AND ATOMS
Authors: PAN GUANG-YAN  , LEI ZI-MING  , YANG FENG  , LU XIAO-LIN  , LIU CAN-WEN  , LIU JIA-RUI  , SUN XIANG  ,   中国科学院物理研究所,北京,100080
Published: November 2020

The VUV emission spectra have been absolutely measured in collisions between Ar+ and He, Ne, Xe by using LHT-30 Monochromator. The ionization excitation processes of incident ions and target atoms have been observed. The "promotion" of electron of molecular orbit model of Fano and Lichten, and adiabatic MO correlation diagram have been introduced. We have made attempt to work out some qualitative explanation.
COMPARISON OF IONIZATION CROSS-SECTION FORMULAS WITH EXPERIMENTS IN MICROANALYSIS
Authors: TANG TAO  , ZHANG SHU-YUAN  , WU ZI-QIN  ,   (1)中国科学技术大学基础物理中心,合肥,230026; (2)中国科学技术大学结构分析开放研究实验室,合肥,230026
Published: November 2020

Characteristic X-ray intensity ratios of M and L lines I(M)/I(L) from a series of pure elements were measured in the analytical electron microscope at 75-200kV. Compiling the previous measured ratios together, all the data have been compared with the calculated values from eight cross-section formulas after normalization in order to eliminate the uncertain parameters, leaving only the voltage dependence of the cross-section. These formulas can be divided into four groups for I(L)/I(K) or three groups for I(M)/I(L) ratios. Only one group, containing two formulas suggested by Fabre de la Ripelle and Schreiber and Wims, is in good agreement with all the experimental data.
GENERATION OF PHOTON-NUMBER SQUEEZED STATE BY OPTICALLY PUMPED THREE-LEVEL ATOMIC SYSTEM
Authors: GUO GUANG-CAN  , CHAI JIN-HUA  ,   中国科学技术大学物理系,合肥,230026
Published: November 2020

In this paper, we show that the photon-number squeezed state can be generated by optically pumped three-level atomic system. The Fano factor of the output radiation field has been calculated under the condition of incoherent pumping, weak coherent pumping and strong coherent pumping respectively. We find that the optimum squeezing effect of photon-number occurs in the situation of weak coherent pumping and the corresponding Fano factor is 0.16. This method of generating photon-number squeezed state is convenient and practical in experiment.
EFFECT OF Sc-Cu SUBSTITUTION ON THE ELECTRONIC STRUCTURE OF Y-Ba-Cu-O(123) SYSTEMS
Authors: WANG HUAI-YU  , ZHANG LI-YUAN  , LIU FU-SUI  , WANG EN-GE  ,   (1)北京大学物理系,北京,100871; (2)北京大学物理系,北京,100871;烟台大学物理系
Published: November 2020

The electronic structures of high Tc superconductors YBa2Cu2ScO7, including two cases of Sc substituting Cul and Cu2 sites, are studied. Sc-Cu2 replacement has effects on electronic structure of Cu-O layers, which may possibly destroy the high temperature superconductivity. However, our calculations show that it is more likely for Sc to substitute Cul site. It is shown that the overlapping splitting between the major bonding partial wave of Sc and its remaining four 3d orbitals is as large as 4eV. Thus one can detect experimentally, by near infrared fluorescence, whether Sc substitute Y or Cu sites in Sc-Y-Ba-Cu-O materials.