bluuebunny/crossref_metadata_2025 huggingface dataset:
SYMMETRY AVERAGE POINTS IN THE BRILLOUIN ZONE
Authors: XUE FANG-SHI  ,   南京电子器件研究所
Published: November 2020

We present sets of symmetry average points in the Brillouin zone from which the average over the Brillouin zone of a periodic function of wave vector can be determined easily. The calculation accuracy is comparable to that of special points, but the calculation labour is reduced considerably. The symmetry average points for crystals with cubic and hexagonal Bravais lattices are given and the calculation accuracy is illustrated numerically through an real example.
THE ROUGHNESS OF THE Si-SiO2 INTERFACE
Authors: HUANG BING-ZHONG  , YU YU-ZHEN  , HONG GUO-GUANG  ,   (1)香港大学; (2)中山大学物理系
Published: November 2020

The roughness at the Si-SiO2 interface has been determined by the ellipsometric spectroscopy. Several geometric forms have been used to simulate the surface irregularities. The dielectric properties of the rough layer are modelled in the effective-medium approximation by dividing the rough layer into a number of sub-layers with equal thickness. The asperity height H (normal to surface) and the correlation length L (along the surface) can be defined by best fit of the theoretically calculated multiphase reflective ellipsometric parameters ψcal, △cal to the measured ellipsometric parameters ψexp, △exp. It is found that the trend of the electric properties of the sample is consistent with the variance of its roughness. It is also found that the dielectric function of Si has some anisotropic properties at the interface.
THE CHARACTERIZATION OF FLUX PINNING FORCE FOR Nb3Sn SUPERCONDUCTING MATERIALS IN HIGH MAGNETIC FIELDS
Authors: CAO ZHONG-SHENG  , CUI CHANG-GENG  , ZHOU LIAN  ,   (1)宝鸡有色金属研究所; (2)中国科学院物理研究所; (3)中国科学院物理研究所,中国科学技术大学研究生院
Published: November 2020

Expenrimental results of Jc(B) in high magnetic fields for diffusion and CVD Nb3Sn tapes and MF Nb3Sn wires have been analysed by using regression analysis, the empirical rules for Jc(B) and FP(B) in high magnetic fields were obtained. The rules are different from Kramer scaling law. There is a need for a new model of flux pinning mechanism to explain the empirical rules.
[Al-O-P] GROUPS IN Na2O- Al2O3-P2O5 GLASSES
Authors: JIN YI-FEN  , CHEN XIANG-SHENG  , HUANG XI-HUAI  ,   中国科学院上海硅酸盐研究所
Published: November 2020

In this paper, we present the Raman spectra of [Al-O-P]- groups in Na2O-Al2O3-P2O5 glasses. We attribut the regular shift of high frequency peak in the Raman spectra to the decrease in the glass network polymerization.
SUBBANDS AND OPTICAL TRANSITIONS OF SUPERLATTICES IN ELECTRIC FIELD
Authors: XIA JIAN-BAI  , HUANG KUN  ,   中国科学院半导体研究所
Published: November 2020

On the assumption of stationary states, the effective mass theory is extended to the of superlattices in electric field. When the tunnel penetration factors are small, the calculation results are in agreement with those of tunnel resonance method. Subbands, wavefunc-tions and optical matrix elements are calculated. It is found that the shifts of particle densities and energies of the second excited states are opposite to that of ground states. In the electric field the overall shape of subbands is close to that without electric field but the double degeneracy is removed. With the increase of electric field, the selection rule △n=0 goes over to △n =±1 gradually, this change-over occurs at moderate electric field.
EFFECT OF DIAGONAL DISORDER ON THE UPPER CRITICAL FIELD OF THE LOCAL ELECTRON PAIR SYSTEM
Authors: LI YAN-MIN  , ZHANG LI-YUAN  ,   (1)北京大学物理系; (2)中国科学院物理研究所
Published: November 2020

The effect of diagonal disorder on the upper critical field of the local electron pair system is studied in the framework of the mean field approximation. It is obtained that this kind of disorder greatly changes the temperature behavior of H(c2). Comparing che upper critical field of this system with those of heavy fermion superconductors CeCu2Si2 and UPt3, we find that it could have the similar unusual temperature dependence.
CHARACTERISTICS OF THE LOW-TEMPERATURE RESISTIVITY OF GRANULAR SUPERCONDUCTOR Ba2YCu3O7-δ
Authors: YU DAO-QI  , PAN GUO-QIANG  , ZHAO YONG  , SUN SHI-FANG  , CHEN ZU-YAO  , ZHANG QI-RUI  ,   (1)中国科学技术大学物理系; (2)中国科学技术大学应用化学系
Published: November 2020

We have studied the relation between the low-temperature resistance of single phase Ba2YCu3O7-δ and magnetic field, temperature and measuring current. The results show that the resistance behavior varies obviously with the strength and direction of the field as well as the measuring current. We suggest that all the results are associated with the granular structure of the sample.
ELECTRON SPIN RESONANCE INVESTIGATION ON Si-H BONDS AND H-INDUCED DEFECTS IN SINGLE CRYSTALS OF SILICON
Authors: SU FANG  , C. LEE  , P. C. TAYLOR  ,   (1)美国犹他大学物理系; (2)中国科学技术大学基础物理中心
Published: November 2020

The properties of Si-H bonds and H-induced defects in single crystal silicon were investigated by means of photoluminescence, nuclear magnetic resonance and electron spin resonance. The results of photoluminescence indicate that the Si-H bonds induced a lot of non-radiative centers. The relation of average thickness of samples to electron spin resonance measurement was observed and discussed.Our work overcomes the difficulties in association with diffusion of H through the surface during annealing in vacuum and with ESR measurement when the thickness of the samples was over 1.00 mm or less than 0.85 mm. in comparing the ESR results for single crystal silicon grown in hydrogen and that in argon atmosphere, we got the amount of hydrogen to be 4×l016cm-3 and the activation energy to be about 0.1 eV. The former agrees quite accurately with references [6] , [10] . The later is one order lower than the activation energy of precipitation reported in reference [11] .
THE PREPARATION AND PHYSICAL PROPERTIES OF B1 STRUCTURE MoNx THIN FILMS
Authors: SHI YIN-HUAN  , ZHAO BAI-RU  , ZHAO YU-YING  , LI LIN  ,   中国科学院物理研究所
Published: November 2020

We have measured the superconducting transition temperature Tc and resistivity ρ(T) (from Tc onset to 300 K) of the reactive sputtered MoNx thin films. The X-ray diffraction, Rutherford back scattering (RBS), Auger and XPS technique were used for exmination of these specimens. The results showed that Tc and ρ(T) change with the concentration of nitrogen in thin films obviously. For Bl structure or nitrogen-rich samples, Tc is lower than 4.2 K. dρ/dT is negative as temperature is higher than Tc onset. Auger analysis indicated that the existence of oxygen and carbon could be also the reason for very low Tc and semiconducting behaviour in ρ(T) of this kind of thin films.
ELECTRONIC STRUCTURES OF 3d-TRANSITION METAL IN GaAs1-xPx ALLOY SYSTEM
Authors: GU YI-MING  , HUANG MING-ZHU  , WANG KE LING  ,   中国科学技术大学物理系
Published: November 2020

The theory proposed by P. Vogl ct al. is extended to the 3d-transition metal impurities doped GaAs1-xPx alloy system. For different compositions, i.e. different x, the acceptor levels, donor levels, local charges and spin-densities of different 3d impurities are predicted. The theory agrees well with the relevant experimental data and reveals their major chemical trends. The physical mechanisms which are responsible for the variation trends of theoretical and experimental results are also discussed.
THE THEORY OF SUPERCONDUCTIVITY IN CeCu2Si2 AND UBe13 (Ⅱ)——THE CALCULATIONS OF THERMODYNAMIC QUANTITIES
Authors: XU JI-HAI  ,   山东大学物理系
Published: November 2020

The thermodynamic critical field of superconducting state, the jump of the specific heat at Tc and the behaviors of the specific heat below Tc have been calculated by using the modef and the gap equations given in Ref [1] . It is shown that the critical values of the thermodynamic quantities are qualitatively in agreement with the experimental results,and the behaviors of the specific heat are in accordance with those results of CeCu2Si2 and UBe13 at all temperatures.
TIME RESOLVED ELECTRON TEMPERATURE AND DENSITY IN A PULSED LASER PLASMA
Authors: CHENG CHENG  , SUN WEI  , TANG CHUAN-SHUN  ,   (1)杭州师范学院物理系; (2)浙江大学物理系
Published: November 2020

A method to determine the electron temperature and density from the time resolved spectra of hydrogen atoms left in a pulsed laser plasma is described. The temporal behavior of electron temperature and density in a CuBr laser is obtained by employing this method.
PARTICLE DETECTOR MODEL FOR INSTANT RESPONSE
Authors: XU FENG  , LIU LIAO  ,   北京师范大学物理系
Published: November 2020

In this paper, Unruh-DeWitt type particle detector is reformed to detectors with instant response. After this reformation, all ideal particle detectors become equivalent, although they respond differently to different quantum state. This kind of detectors are designed to detect the quantity 2>, just as Davies desired. Furthermore, a useful method for calculating the instant response function for a detector with monopole coupling and moving arbitrarily in a Minkowski vacuum is presented.
STUDIES OF THE CRITICAL SURFACE AND PHASE TRANSITION OF THE T-H MODEL
Authors: FAN WEI-JUN  , SUN FENG-GUO  ,   国防科学技术大学应用物理系
Published: November 2020

The critical properties of a generalized mixed spin model (T-H model) on two dimensional hexagonal lattice are studied by using real space renormalization group and mean field methods. An Ising, a tricritical and a first-order phase transition fixed point are found. At last, some exact results of this model are found by using star-triangle transformation method.
STUDIES ON THE AMORPHOUS STATE FORMATION EFFECT OF BORON ION IMPLANTATION INTO POLYCRYSTALLINE IRON THIN FILMS
Authors: ZHANG YUE-LU  , BI SI-YUN  , MEI LIANG-MO  , LUAN KAI-ZHENG  , LIU YI-HUA  ,   山东大学物理系
Published: November 2020

The permeability of polycrystalline iron thin films implanted with different doses of boron ions rises nonmonotonously with increasing dose, while the 57Fe conversion electron Mossbauer spectra of the films have shown the formation of amorphous metallic alloy. The results favour the critical defect density model of amorphous state formation.
THE MULTI-PHOTON QUANTUM STATITISCAL THEORY OF DRIVEN OPTICAL SYSTEMS (II)——BAD CAVITY CASE
Authors: ZHANG LIN  , LIN REN-MING  , HUANG SI-XIAN  ,   福建师范大学物理系
Published: November 2020

In this paper, the multi-photon FPE of driven optical systems are treated for bad cavity case. The semi-classical linear stability analysis are performed. The non-classical effects are discussed, and it is shown that in two-photon case the atom-atom correlation enhances the non-clasical effects. This is in opposite to the single-photon case, and different from the good cavity case. The two-photon spectrum of transmitted light and resonance fluorescense are obtained, where the Rabi frequency Ω∝y2 (y is the incident field).
PLANE AND SPHERICAL WAVES SOLUTIONS OF THE FIELD EQUATION FOR A COMPLEX SCALAR FIELD WITH A CUBIC NONLINEAR TERM IN FOUR DIMENSIONAL MINKOWSKI SPACE
Authors: LI FU-BIN  ,   淮北煤炭师范学院物理系
Published: November 2020

The field equation for a complex scalar field with a cubic nonlinear term in tour-dimensional Minkowski space is studied. Two classes of exact solutions, corresponding to solutions of plane and spherical waves, are presented.
AN ANALYTICAL STUDY ON THE SCALING PROPERTIES OF DIFFUSION-LIMITED AGGREGATION IN EXTERNAL FIELDS
Authors: YU JIANG  , HU GANG  ,   (1)北京师范大学物理系; (2)北京师范大学物理系,中国高等科学技术中心(世界实验室)理论物理中心
Published: November 2020

We have investigated the scaling properties of DLA clusters grown in the various kinds of external fields, using the meanfield theory with the continuum approximation. Our results show that the density of the growing cluster, ρ, initially dropping as 1/r, and becomes a constant value for constant external field. For the fields of type 1/rα we find that the aggregates exhibit very complicated, non-trivial scaling behaviours with the control parameter a varying.
TEMPERATURE DEPENDENCE OF HARD BUBBLE FORMATION IN PULSE BIAS FIELDS
Authors: HAN BAO-SHAN  , XIU JIA-FA  , NIE XIANG-FU  , SUN HUI-LING  , OUYANG FANG-LI  , TANG GUI-DE  ,   (1)河北师范大学物理系; (2)吉林大学物理系,1985年毕业生; (3)中国科学院物理研究所
Published: November 2020

The temperature dependence of VBL group formation in stripe domain walls of epitaxial garnet bubble films was investigated by means of the method of single-pulse bias field. A critical temperature T02 was found, which relats to the parameters of bubble films. When T >T02, hard bubbles no longer form. It was also found that, when T02, there are two different stages for VBL group formation. Their demarcation temperature is T01. The experimental curves in the first stage have been qualitatively interpreted. And the difference of soft domain segment movements, which lead ro their hardening, in the two stages has been revealed by means of the method of double exposure photography.
STRUCTURAL AND MAGNETIC PROPERTIES OF Sm (Ti, Fe)12 INTERMETALLIC COMPOUNDS
Authors: YANG YING-CHANG  , KONG LIN-SHU  , CHENG BEN-PEI  ,   (1)北京大学物理系; (2)中国科学院固体物理研究所
Published: November 2020

The rare earth-iron intermetallic compounds of SmTiFex with x ranges from 8 to 11, was synthesized by are-melting technic. We found that they crystallize in the ThMn12-type tetragonal structure, 14/mmm. We report here the crystallographic and magnetic properties of Sm(Ti, Fe)12 and Gd (Ti, Fe)12. Unusual uniaxial magnetocrystalline anisotropy was observed in Sm(Ti, Fe)12 compounds. For Sm(Ti, Fe)12, the c-axis is the easy magnetization direction, and Curie temperature is 610 K. The magnetizrystalline anisotropy of Sm and Fe sublattices in Sm(Ti, Fe)12 compounds was analyzed by measuring magnetization curves of Gd(Ti, Fe)12. On the basis of our data, we conclude that both Sm and Fe sublattices have easy axis. After the discovery of Nd2Fe14B magnets, Sm(Ti, Fe)12 is another ternary rare earth-iron intermetallic compounds with strong uniaxial anisotropy.
SURVEY OF PREBREAKDOWN PARAMETERS OF NF3
Authors: LI ZHENG-YING  ,   华中工学院电力系
Published: November 2020

Using the pulsed drift-tube-mass spectrometer system, we measured the prebreakdown pa-rameters of NF3 mixtures used in excimer lasers or produced in discharges of SF6 mixtures, including electron attachment coefficients, attachment rate coefficients, ionic mobilities and kinds of negative ions. The relations between electron attachment rate coefficients and mean electron energies are measured as well.
IN-SITU STUDY OF THE SUPERCONDUCTING TRANSITION AND INTERNAL FRICTION OF HIGH Tc SUPERCONDUCTOR YBaCuO
Authors: DU JIA-JU  , JIANG JIAN-YI  , WANG XIANG  , YIN HUA-QING  ,   中国科学院固体物理研究所
Published: November 2020

The resistance, internal friction and Young's modulus of a high Tc superconductor-YBa2Cu3O7-δ were measured in-situ at 80 K to 300 K. Two obvious peaks of internal friction were observed near Tc On account of character of the peaks, we suggest that these two peaks are associated with the eletronic relaxation between Cu3+ and Ca2+ The peak and anomalies of Young's modulus observed in the range of 160 K to 280 K may be related to the position adjustment of oxygen vacancies.
INFLUENCE OF OXYGEN DEFICIENCY ON THE THERMOELECTRIC POWER IN SINGLE PHASE YBa2Cu3O7-x SYSTEM
Authors: RUAN YAO-ZHONG  , HU XUE-LONG  , LI LI-PING  , ZHAO YONG  , PAN GUO-QIANG  , CHEN ZU-YAO  , ZHANG QI-RUI  ,   (1)中国高等科学技术中心(世界实验室)理论物理中心; (2)中国科学技术大学物理系; (3)中国科学技术大学应用化学系
Published: November 2020

The influence of oxygen deficiency on the superconductivity and the thermoelectric power in single phase YBa2Cu3O7-x system was studied. The results show that the superconducting transition temperature decreases, and the magnitude of the thermoelectric power increases with the amount of oxygen vacancies. From the experimental results we suggest that holes conduction is predominant in single phase YBa2Cu3O7-x system, the relatively large phonon-drag thermopower indicates that there exists strong electron-phonon interaction in YBa2Cu3O7-x superconductors.
EXACT SOLUTION OF A GENERALISED MIXED SPIN MODEL ON DISORDER DOMAIN
Authors: TANG KUN-FA  , HU JIA-ZHEN  ,   上海交通大学应用物理系凝聚态物理研究所
Published: November 2020

A condition given by Baxter for the general IRF model to exhibit a disorder solution is applied to a generalised mixed spin model. The exact expression for the free energy and the condition ensuring the validity of it are obtained. The asymptotic behaviour of the intra-row correlations is discussed.
RELATION BETWEEN THE FORM OF THE NORMALIZED EFFECTIVE PHONON SPECTRUM AND THE SUPERCONDUCTING Tc
Authors: WENG ZHENG-YU  , WU HANG-SHENG  ,   中国科学技术大学物理系
Published: November 2020

The numerical solution of the Eliashberg equation is analysed by a graphic analytic method, and the following conclusions are arrived. The superconducting Tc of a superconductor can be enhanced through the ‘hardening' of its normalized effective phonon spectrum g(ω). And the ‘softening' of g(ω) could enhance the Tc for a superconducting material with small λ, but not for the superconductor whose A is large.
THE ELECTRON STRUCTURE, MAGNETISM AND SUPERCONDUCTIVITY OF AMORPHOUS Nb-Ni ALLOYS
Authors: WU BAI-MEI  , CHEN ZHAO-JIA  ,   中国科学技术大学物理系
Published: November 2020

The electron structures of amorphous Nb100-xNix (x= 65, 59.8, 56.4) alloys are studied by means of UV-Photoelectron spectroscopy (UPS). It is found that the position of the Fermi level is located near the minimum of the density of states, which explains the double Curie-point phenomena in Nb-Ni alloys. Analysing the electron structure of Nb-Ni alloys, it is pointed out that the hybridization of two d-bands with energies close to each other may form a new hybridizated band near EF and the hybridization is related to the valence difference. The charge transfer makes the peaks of bands shifting. The density of states of TE-TL. alloys at EF should include two parts of contributions, i.e., that from 3d electron stsates, which is of advantage to magnetism, and that from 4d electron states, being of advantage to superconductivity. Different ratio of these contributions at Er influences the magnetism and superconductivity of the alloys greatly. The coexistence of localized magnetic moments and superconductivity has also been discussed.
INTERMITTENCY AND LOW FREQUENCY NOISE IN JOSEPHSON JUNCTION
Authors: XIAO WAN-RU  , YAO XI-XIAN  ,   (1)南京大学物理系; (2)南京建筑工程学院物理教研室
Published: November 2020

The bifurcations, chaos and intermittency in the f-biased Josephson junction are investigated by numerically integrating the equation for Stewart-McCumber model with an interference "∈ cosφ" terra. In addition, the relation between low frequency noise and the routes to chaos in Josephson junctions is discussed.
AN INTERNAL FRICTION STUDY OF INTERFACE DYNAMICS IN THE PROCESS OF PHASE TRANSFORMATIONS OF NiTi ALLOY
Authors: ZHANG JIN-XIU  , LUO LAI-ZHONG  ,   中山大学物理系
Published: November 2020

The Martensitic (MP) and incommensurate/commensurate (I/C) phase transformations during the athermal process of NiTi alloy were studied by the measurements of internal friction, elastic modulus and electric resistance simultaneously. The IF behaviour in the processes of MP and I/C phase transformations are nearly the same and is associated with the motion of phase interface under the action of phase transformation driving force. Starting with the interface dynamics model, the interface dynamic behaviour of MP and I/C transformations were . studied. An explicit functional relationship of the interface dynamics in the process of marten-sitic transformation was obtained as V = V* exp(-△G*/△G - △GR) and the expression for IF during the process of phase transformation as Q-1 = (n2/2)×(μ△G*/(△G-△GR)2) dF/dT·T/ω. The transformation resistance froce △GR is the order of 10 cal/mol. The "soft mode effect" during the transformation process was discussed, and it was shown that the softfening of pho-non mode and the modulus defect associated with interface motion coexist in the processes of martensitic and I/G phase transformations.
XPS STUDY OF SURFACE NITROGEN ON PET ACTED BY LOW TEMPERATURE PLASMA AND LOW ENERGY IONS
Authors: WU NAI-JUAN  , XIE KAN  , HU JIAN-FANG  , HONG MING-YUAN  , LI HUI-NAN  ,   中国科学院物理研究所
Published: November 2020

ESCA analysis identifies that the different functional groups of nitrogen compounds have been conbined on the PET surfaces, when modified by the air plasma and the argon plasma. In particular, the double N15 peaks occur on the PET surface after 5 minutes treatment by the low temperature argon plasma. The second peak-N15 is considered as the contribution of nitrogen oxides. The double peaks PET-N15 structure does not result by bombardment with low energy nitrogen ions and argon ions, which indicates that the effect can not be attributed to the action of low energy ion alone.
EXPERIMENTAL MEASUREMENTS OF ELECTRON ANOMALOUS HEAT CONDUCTIVITY ON CT-6B TOKAMAK
Authors: LI WEI-QIANG  , QI XIA-ZHI  , WANG LONG  ,   (1)中国科学技术大学; (2)中国科学院物理研究所
Published: November 2020

Experimental measurements of electron thermal condouctivity coefficient on the CT-6B device are reported here. With the help of MHD internal disruption, which specifies the temperature sawtooth perturbation, analysing the amplitudes, cycles and phases of the perturbation signals of soft x-ray detectors, we have calculated the average electron thermal coefficients in different radiuses. Experiment results are an order of magnitude larger than that predicted by neoclassical theory, showing that electron heat conductivity in the CT-6B plasma is an anomalous one. It is shown that MHD internal disruption can make the energy transport increases obviously. Electron heat conductivity increases with the amplitude of MHD perturbo-tion.
STRUCTURE INVESTIGATIONS ON HALIDE GLASSES (MnF2)x(BaCl2)100-x WITH THE EXAFS AND WAXS TECHNIQUES
Authors: XIANG SHI-BING  , HUANG SHENG-TAO  ,   (1)武汉大学物理系; (2)武汉大学物理系,现在中国科学院物理研究所
Published: November 2020

A short range structure investigation of halide glasses (MnF2)x(BaCl2)100-x(x = 65, 60, 55) has been made using the extended X-ray absorption fine structure (EXAFS) and the wide angle X-ray scattering (WAXS) techniques. The local structure information around the Mn is derived from the study of the MnK absorption edge EXAFS and the X-ray scattering intensity of the materials, respectively. The results show that the F and Cl atoms in the first neighbour shell of the Mn atom construct a octahedra (MnCl2F4) with the bond-length rMn-Cl = 0.246 nm and rMn-F= 0.200 nm in the glass of x = 65, which share the atom F with the neighbouring one to form zigzag chains linked by Ba atoms distributed between them. With decreasing of the amount of MnF2 below x = 65, the bond-length rMn-Cl and the Debye-Waller factor σMn-Cl2 of Mn-Cl increase, and that of Mn-F is almost invariant. The disappearance of the Mn-Mn peak has been found from x = 60 to x = 55 with an abrupt increase in rMn-Cl and σMn-Cl2, which can be explained as the chains being broken to form the solitude octahc-dra (MnCl2F4).
SCATTERING WAVE FUNCTION ANALYSIS METHODS IN APERIODIC POTENTIAL
Authors: ZHAO BAO-HUA  , ZHENG ZHAO-BO  ,   (1)东北工学院物理系; (2)中国科学技术大学物理系
Published: November 2020

New methods for obtaining the scattering wave functions of an aperiodic potential are developed. The analysis of amplitude and phase of scattering wave functions demonstrates the efficiency of these methods.
POUR-BRANCH CRITICAL SURFACE AND CORRESPONDING CRITICAL BEHAVIOUR FOR ISING MODEL
Authors: TANG KUN-FA  , HU JIA-ZHEN  ,   (1)上海交通大学凝聚态物理研究所; (2)上海交通大学应用物理系
Published: November 2020

Application of exact renormalisation transformation, to Ising model via equiscale transformation in the same universality class, yields a four-branch critical surface and four fixed points. In the case of the ferromagnetic and antiferromagnetic phase transitions, the results are in agreement with the known exact and the best approximate ones very satifatorily. For the supperantiferromagnetic phase transition, we propose the critical surface equation as follows —ch(h) = sh(2Kx)sh(2Ky).
ENERGETIC TRAPPED PARTICLE STABILIZING EFFECT OF INTERNAL KINK MODE
Authors: CHEN YAN-PING  , R. J. HASTIE  , KE FU-JIU  , CAI SHI-DONG  , L. CHEN  ,   (1)美国普林斯顿大学等离子体物理实验室; (2)英国卡拉姆实验室; (3)中国科学院物理研究所; (4)中国科学院物理研究所,北京航空学院应用数理系
Published: November 2020

The Grad-Shafranov equilibrium equation for an anisotropic Tokamak plasma is rederived using the method of Greene, Johnson and Weimer. The stabilizing effect of the anisotropic energetic particle component on the internal kink mode in the Tokamak plasma has been analyzed with the generalized energy principle. Detailed calculation on this effect is performed for two kinds of energetic particle distribution function of slowing down in energy and square top poloidal pressure profile. The stability window of internal kink mode due to the energetic trapped particles with magnetic turning point at high field side is obtained. It's relation with various physical parameters is discussed in some depth.
INDIRECT EVIDENCE OF FORWARD SCATTERING——PERIODIC STRUCTURE OF THE STIMULATED BRILLOUIN SCATTERING SPECTRA OBTAINED IN LASER.PLASMA INTERACTION EXPERIMENTS
Authors: XU- ZHI-ZHAN  , TANG YONG-HONG  , QIAN AI-DI  ,   (1)中国高等科学技术中心(世界实验室)凝聚态与辐射物理分中心,中国科学院上海光学精密机械研究所; (2)中国科学院上海光学精密机械研究所
Published: November 2020

Periodic structure of stimulated Brillouin backscattering spectra have been observed in ex-periments of intense Nd glass laser irradiating planar targets. Analysis and calculation indicate that this period structure results from the interaction between the ion-acoustic wave and the scattering light wave, the former is produced by the stimulated forward scatting and the latter by the stimulated backward scatting or scattering in other directions. From the wavelength shifts and period of the spectra, the temperature or drift velocity of the coronal plasma and the direction of forward scattering can be estimated.
THE EFFECTS OF TRANSITIONAL PARTICLES DRIVEN BY SINGLE WAVE
Authors: QIU YUN-QING  , XIA MENG-FEN  ,   北京大学物理系
Published: November 2020

The unperturbed separatrix crossings driven by a single wave are discussed. The separa-trix crossings are followed by a mixing process, and a small-scale structure occurs in the distribution function in h-ψ plane. The separatrix crossings form a convective process in h-ψ plane, and the convective flux and the net flux are calculated. The separatrix crossings are accompanied by a radial flux, which is composed of a directional flux and a diffusional flux, both of them are calculated.
STATIC CHARACTERISTICS OF CIRCULAR SYMMETRIC ANNULAR JOSEPHSON JUNCTION (Ⅱ)——THE STABILITY OF THE SOLUTIONS OF THE SELF-FIELD EQUATIONS
Authors: WANG WEI  , YAO XI-XIAN  ,   南京大学物理系
Published: November 2020

The stability of the solutions of the self-field equations for the circular symmetric annular Josephson junctions is analyzed in this paper. The stability of the solutions is determined by the signs of the second-order variation of the free energy with respect to the variation of the phase difference in the junctions. This criterion can then be tranformed to a eigenvalue problem. The solutions may be stable, nonstable, or metastable for a given bias current.
EXCITATION OF ELECTRON PLASMA WAVES BY BEATING TWO SELF-TRAPPED LASER BEAMS
Authors: MA JING-XIU  , 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

This paper presents and analyzes the focusing of pump beams and the excited EPW (electron plasma wave) in a PBWA (plasma-beat-wave accelerator) by beating two self-trapped laser beams. The equations governing the saturated amplitudes of EPW in nonuniform pump beams have been derived analytically. With these, the condition for self-trapping of pump beams has been studied self-consistently. The optimum frequency mismatch parameter and the corresponding optimum initial plasma density as well as the maximum amplitde of the EPW have been obtained analytically. The transverse distribution of the EPW for Gaussian pump profiles has been calculated numerically and shows peculiar characteristics for certain frequency mismatch parameters. In addition, the component of the EPW electric field due to the nonuninformity of pump beams has been obtained and its influence on particle acceleration in PBWA has been briefly discussed.
NONLINEAR THEORY OF PHOTOACOUSTIC EFFECT OF RESTRICTED BEAM
Authors: DU GONG-HUAN  ,   南京大学声学研究所
Published: November 2020

When a chopped light impinges on a solid sample in an photoacoustic cell, an acoustic signal is produced not only with the fundamental but also with the second harmonic component because of the nonlinear photoacoustic effect. An equation of nonlinear thermal wave beam is presented with nonlinear boundary conditions and solved by using the perturbation approach method under the case that the light source has a Gaussian profile. The Hankel transformation is utilized to attain the first and second order approximation solutions of the equation.The analytic results show that the thermal wave beam of second harmonic still maintains the Gaussian profile with a smaller Gaussian radius than that of the fundamental component and also the amplitude of the second harmonic relates with not only the linear but also the nonlinear thermal parameters which might be expected to provide more information from the sample than the linear one.Basing on these vesults, a new nonlinear paotoacoustic technique would be expected to develop.
ELECTRICAL PROPERTIES OF CRYSTALLINE-NONCRYSTAL-LINE COMPOSITE Li IONIC CONDUCTOR
Authors: NAN CE-WEN  , WANG LE  ,   (1)武汉工业大学硅酸盐材料科学与工程系; (2)武汉工业大学硅酸盐材料科学与工程系,北京建筑材料科学研究院
Published: November 2020

In the paper, the electrical properties of crystalline LiCl-noncrystalline Li2O·3B2O3 composite Li ionic conductor are studied. Some new phenomena of changes in electrical properties of this composite ionic conductor have been found, i.e. a "two-peak" effect of conductivity enhancement appears on macroscopic conductivity σm versus composition curve. Correspondingly, "two-valley" appears on apparent activation energy Em versus composition and dielectric constant εm versus composition curve. These experimental phenomena have been discussed in detail, and the results are consistent with conduction theory.
POLARITONS IN MAGNETIC SUPERLATTICES
Authors: SHI HANG  , CAI JIAN-HUA  ,   (1)南京大学固体物理研究所; (2)上海交通大学凝聚态物理研究所
Published: November 2020

We study systematically the coupled electromagnetic modes in magnetic superlattices. Dispersion relations are obtained for most general directions of the magnetic field and the wa-vevector, in the magnetostatic limit. A general discussion is also given for magnetic polari-tons including retarded effects.
THE SUPERCONDUCTING PROCESS OF SOME DOPED SEMICONDUCTORS——THE IMPURITY-PLASMON MODEL
Authors: WANG WEN-GUO  , MA BEN-KUN  ,   北京师范大学物理系
Published: November 2020

An impurity-plasmon model is presented to describe the superconducting process of some doped semiconductors. The linear decreasing Tc-△P relation is obtained which is verified qualitatively by the hydrostatic pressure experiments. A criterion for superconductivity is given and a new method of measuring the Fermi energy level is proposed for semiconductors exhibiting superconductivity.
THREE-PARAMETER FAMILY OF SOLUTIONS FOR STEADY-STATE SELF-CONSISTENT DENSITY PROFILE
Authors: SHEN WEN-DA  , ZHU SHI-TONG  ,   (1)上海科学技术大学物理系; (2)中国高等科学技术中心(世界实验室)理论物理中心,中国科学院上海光学精密机械研究所
Published: November 2020

Exact analytic method is used to derive a threeparameter family of solutions for the steady-state selfconsistent density profile in a laser plasma. Several special cases are discussed, and the density profile of plateau structure given by Lee ei al. is shown to be just one of thesecases.
ANISOTROPY OF THE NEUTRON DIFFRACTION INTENSITY ENHANCEMENT EFFECT OBSERVED IN α-LiIO3 SINGLE CRYSTAL UNDER SMALL DC VOTLAGE
Authors: YANG ZHEN  , LI QIANG  ,   中国原子能科学研究院
Published: November 2020

The strong anisotropy of the neutron diffraction intensity enhancement effect observed in α-LiIO3 single crystal under dc voltage was investigated systematically with a 4-circle neutron diffractometer. Analysis of the result shows that both the enhancement and its anisotropy can be explained in the framework of the classical neutron diffraction extinction theorey only if the applied dc voltage is low enough.
NON-PROPAGATING SOLITARY WAVES ON THE INTERFACE BETWEEN TWO LAYERS OF FLUIDS IN RECTANGULAR WAVEGUIDE
Authors: YAN JIA-REN  , HUANG GUO-XIANG  , HUANG NIAN-NING  ,   (1)武汉大学物理系,华中工学院物理系; (2)湘潭大学物理系
Published: November 2020

We stutied the nonlinear modulation of the gravitation surface-tension waves on the interface between two layers of imcompressible inviscid fluids which are contained in a rectangular waveguide with horizontal solid walls, by the meth rd of multiple scales technique, and generalized the theory of Larraza and Putterman. Including the surface-tension effects, we found that the first order modulated wave satisfies the cubic Schrodinger equation. Then me derived the non-propagating solitary solution, and made some discussion on the results obtained.
SELF-CONSISTENT MEAN FIELD IN MANY-BODY CORRELATION DYNAMICS
Authors: WANG SHUN-JIN  ,   中国高等科学技术中心(世界实验室)理论物理中心,兰州大学
Published: November 2020

The self-consistent mean field in the many-body correlation dynamics is discussed in detail. It is shown that the self-consistent mean field exists in general in many-body correlation dynamics for both stationary and non-stationary cases. The many-body correlations enter the mean field through the two-body correlation c2 and the corresponding collision term I. The role played by I is twofold i.e., dynamical effects and statistical effects on single particle states. The many-body correlations also manifest their effects on the many-body energy and yield an energy expression different from the conventional expression in the HF-Bruc-kner theory.
PHOTOLUMINESCENCE DIAGNOSIS OF GaAs/GaAlAs MULTIPLE QUANTUM WELLS
Authors: JIA WEI-YI  , LU ZHI-DONG  , HUANG YI  , ZHOU JUN-MING  , LI YUNG-KANG  , WANG YAN-YUN  ,   中国科学院物理研究所
Published: November 2020

Photoluminescence technique are used to diagnose the quality of quantum wells. The influences on the fluorescence spectra of quantum wells due to thickness fluctuations of quantum wells, fluctuation of aluminium content, various defects, and unintentional impurities, are discussed. And inversely, the possible reasons causing degradation of quantum wells are deduced from the photoluminescence spectra. To some extent the diagnosis can provide certain basic information for improving the molecular beam epitaxy technology.
SYMBOLIC DYNAMICS OF THE CIRCLE MAP
Authors: ZHANG ZHONG-JIAN  , CHEN SHI-GANG  ,   应用物理与计算数学研究所
Published: November 2020

By the method of symbolic dynamics, the Farey sequences, the * products of Farey sequences and M. S. S. sequences, the binary trees and the new trajectories for varied Farey; numbers of the circle map are studied.
EXPERIMENTAL STUDY OF RYDBERG STATES OF AU ATOM
Authors: DING GANG-JIAN  , SHANG REN-CHENG  , ZHANG LIAN-FANG  , WEN KE-LING  , HUI QIN  , CHEN DIE-YAN  ,   清华大学现代应用物理系
Published: November 2020

A beam of gold atoms was produced by heating the gold containing material by electrothermal method. Two UV laser beams then orthogonally irradiated the atomic beam, exciting the Au atoms to very high Rydberg states from their ground states (6S1/2). A high voltage pulsed electric field was applied to the interaction region approximately 200 ns after the laser pulse, it ionized the Au atoms into Rydberg states. By scanning the wavelength of laser in a certain range, the positions of 38 energy levels of Au atoms in n2D3/2 (n = 18-38) and n2S1/2 (n = 21-34; 36-38) series have been determined. the ionization limits of the n2D3/2 and n2S1/2 series were found to be ED = 74409.8 (3)cm-1 and Es = 74410.0(2) cm-1, respectively, by parametric fitting. The quantum defects of all these levels were also calculated.
EXPANSION PROCESSES OF LASER-HEATED PLASMAS ON CARBON AND GOLD PLANAR TARGET
Authors: TANG YONG-JIAN  , ZHENG ZHI-JIAN  , HE HAI-EN  , CHUNYU SHU-TAI  , GONG MEI-XIA  , LEI ZHI-YUAN  , LIU JIN-YUAN  ,   (1)中国工程物理研究院; (2)中国科学院西安光学精密机械研究所
Published: November 2020

Space-time resolved X-ray photograms of carbon (4671? thick with substrate) and gold (15μm in thickness) planar targets were obtained using a pinhole coupled to a soft X-ray streak camera. The planar targets were irradiated with laser (λ = 1.06 μm) pulses of about 100 ps duration from a LF-12 Nd: glass laser. The spectral response of the soft X-ray camera is defined to be 0.1-10 keV. Average plasma expansion velocities on the C and Au traget surface measured at a laser power density of about 1014 w/cm2 for were 5.l×107cm/s and 6.1×107 cm/s respectively.
ORIENTATION DETERMINATION OF THIN CRYSTAL LAYER WITH DIAMOND STRUCTURE BY RAMAN SCATTERING EXTREMA TECHNIQUE
Authors: WU HUA-SHENG  , LAO PU-DONG  , WU JIAN-GEN  , QU FENG-YUAN  ,   复旦大学物理系
Published: November 2020

A method for determining the orientation of thin crystal layer has been proposed, namely the Raman scattering extrems technique. The intensity of Raman scattered light from the diamond structure thin layer as a function of both the normal of the thin layer and the polarization direction of incident light is derived. The orientation of the thin layer is then determined by means of four extrema of this function. The results obtained by this method, for silicon wafers are compared with that dettermined by the X-ray method.
THE PIEZOELECTRIC PROPERTY OF NH4IO2 CRYSTAL
Authors: YIN XIN  , Lü MENG-KAI  , LI FU-QI  ,   山东大学晶体材料研究所
Published: November 2020

The piezoelectric coefficients of NH04IO3 crystal have been measured by interfe-rometric method. The results are d31=35.2, d32=23.4, d33=55.9, d24=-2.4, d15=-9.5×10-8 CGSE/dyn.
THE STRAIN COEFFICIENT OF ELECTRCAL RESISTANCE OF SEVERAL METALLIC GLASSES
Authors: HE HUA-CHUN  , FENG BEN-ZHENG  ,   昆明贵金属研究所
Published: November 2020

The change in electrical resistance of Pd-, Cu-, Ni- and Fe-base metallic glasses in tensile process and the effect of composition, cold deformation and heat treatment on the strain coefficient of resistance k, have been investigated. The results show that the resistivity increases with the increase of strain and K is positive. K of all the alloys are always less than those of pure metals; k of cold deformed state and annealed state samples are greater than that of rapidly quenched state samrte. The physical nature of K and its factors of influence on metallic glasses are discussedpl in virtue of generalized Ziman theory.
CRYSTALLOGRAPHY AND MAGNETIC PROPERTIES OF YTi(Fe1-xNix)11
Authors: YANG YING-CHANG  , SUN HONG  , CHENG BEN-PEI  ,   (1)北京大学物理系; (2)中国科学院固体物理研究所
Published: November 2020

The compounds YTi (Fe1-xNix)11 are found to crystallize in the ThMn12-type tetragonal structure (space group 14/mmm) when x1-xNix)11 has been studied and explained in terms of the interatomic distance dependence of exchange interaction between Fe atoms.
ELECTROREFLECTANCE IN THE VISIBLE RANGE OF SPERCONDUCTING SYSTEM YBa2Cu3O7-δ
Authors: WANG HUI  , WANG RUO-ZHENG  ,   北京师范大学物理系
Published: November 2020

The optical properties of YBa2Cu3O7-δ are studied by electroreflectance spctra. In the visiblr range, two peaks at 1.78 eV and 2.43 eV are obtained. Analysis of the features show the utility of the modulated reflectance techniques for studying the band structure of superconducting system. Hence a new means to study the optical properties of superconducting system is suggested.
PHONONS, PHONON INSTABILITY AND RECONSTRUCTION OF Mo(001) SURFACE
Authors: ZI JIAN  , ZHANG KAI-MING  , XIE XI-DE  ,   复旦大学物理系
Published: November 2020

Effective nearest- and next nearest-neighbor interactions are used to study phonons and phonon softening at Mo(00l) surface with continuously varying the surface interaction parameters αs, and βs. The phonon stability diagram is obtained. The vibrational modes and softening of surface waves are investigated. The relations between softening of surface waves and reconstruction of Mo(00l) surface are discussed in some detail.
DIELECTRIC PROPERTIES OF BIS-(p-TOLUENE SULPHONATE) OF 2,4-HEXADIYNE-l,6-DIAL (TS) AND EFFECT OF THE SOLID STATE POLYMERIZATION
Authors: RUAN YAO-ZHONG  , LI LI-PING  , HE PING-SHENG  , YAO GANG  ,   (1)中国科学技术大学材料科学和工程系; (2)中国科学技术大学物理系
Published: November 2020

The temperature dependence of the dielectric constant of monomer single crystal TS has been determined for the range 77-300 K, two anomalies have been observed near 160 K and 203 K. The variation of the dielectric constant of TS during thermal solid state polymerization is obtained. It the initial stage of polymerization, the dielectric constant decreases slowly; when sample conversion to polymer exceeds 30%, the dielectric constant increases rapidly. We suggest that this behavior may be related to side-group and π-electron and hend explain the results qualitativly.
THE SCALING PROPERTIES OF DLA CLUSTERS WITH ANISOTROPIC DIFFUSION
Authors: YU JIANG  , HU GANG  ,   (1)北京师范大学物理系; (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

We present a coordinate transformation approach to study the effect of anisotropic diffusion-on the growth of DLA clusters. For two-dimensional square lattice, we calculate analytically the Hausdorff dimension of the anisotropic diffusive DLA clusters, and show that the Hausdorff dimension D varies continuously with the anisotropic diffusion probability p, with Dmax = 5/3 and Dmin = 3/2. We also compare our results with the numerical results of Jullien et al., and find a very good coincidence. Finally, we discuss analytically the generalized dimensions Dq for DLA clusters with anisotropic diffusion.
A STUDY ON GROUND-STATE PROPERTIES OF hcp-WC BY FORCE THEOREM
Authors: SHEN YAO-WEN  , LIN ZHI-FANG  , HUANG MEI-CHUN  ,   (1)厦门大学物理系; (2)厦门大学物理系,复旦大学; (3)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

We calculate the ground-state properties of hcp-WC material by local density functional theory and force theorem with LMTO-ASA approximation. Using the electronic pressure as a function of the lattice parameters, the equilibrium lattice constant, the bulk moduli and sound velocity have been calculated. It is found that the error of lattice constant is less than 10%. The effects of different ways for choosing; the atomic sphere radii on the calculated results are discussed. The bond characters of hcp-WC are also analyzed briefly in terms of the electronic partial pressures.
EFFECT OF DC SPACE-CHARGE FIELDS ON EQUILIBRIUM ORBITS OF ELECTRONS IN FREE-ELECTRON LASERS
Authors: ZHANG ZHONG  , ZHANG SHI-CHANG  ,   电子科学技术大学物理系
Published: November 2020

Starting from 3-dimensional model, we investigate the effect of dc space-charge fields on the equilibrium orbits of electrons in free-electron lasers, and find the appearance of a new unstable range of the electron equilibrium orbits.
STUDIES ON THE ADSORPTION OF PYRIDINE MOLECULES ON SILVER SURFACES BY SHG METHOD
Authors: LI LE  , YU GONG-DA  , DONG SHU-YAN  , WANG GONG-MING  , ZHANG ZHI-MING  ,   (1)复旦大学激光物理研究室; (2)苏州大学物理系
Published: November 2020

Systematical studies on the adsorption of pyridine molecules on variously prepared Ag surfaces reveals that the micro-scale cavity-like active sites play an important role in the adsorption of molecules either under ultra-high vacuum or atmospheric environments.
DOMAIN STRUCTURE VARIATION OF Nd2Fe14B SINGLE CRYSTAL WITH ITS THICKNESS
Authors: LUO YANG  , JI QI-GEN  , ZHANG NING  , SUN DA-LIANG  ,   (1)山东大学; (2)冶金工业部钢铁研究总院
Published: November 2020

Domain structure variation of Nd2Fe14B single crystal with its thickness is studied. A critical thickness Lo is found, below which the maze domain pattern appears in the basal plane. When L>Lo, a set of dot-like domains appears inside the basal domains, they are the bottom of cone-shaped reversal domain. The width of basal domain and both size and number of the cone-shaped reversal domain increase with increasing sample thickness. The multiple layered reversal domains can even form with further thickness increasing. The formation of coneshaped domain is discussed, the critical thickness value for cone-shaped domain formation is estimated as well. Based on the experimental results, the domain wall energy is also calculated.
CENTRAL LINE SPIN-LOCKING PHENOMENON OF HALF- INTEGER QUADRUPOLE NUCLEI IN POWDER SAMPLES
Authors: LI GENG-YING  , 邬学文  ,   华东师范大学物理系
Published: November 2020

Spin-locking o f central transition in half-integer quadrupolar systems was studied. The particles which occupy the states of |-1/2> and |l/2> may form an isolated sub-system, and it obeys the spin temperature theory in rotating frame. We calculated the intensity of spin-locking signal by density operator approach. The result was verified by experimental observations on 23Na-NMR spectra of NaNo2 and NaOH powders.
THE VIBRATIONAL PROPERTIES AND MELTING TEMPERATURES OF SMALL Si CLUSTERS
Authors: ZI JIAN  , ZHANG KAI-MING  ,   复旦大学物理系
Published: November 2020

The ground-state structures and ground-state energies of small Sin (N = 2-7) clusters are investegated using the Stillinger-Weber potential. The vibrational spectra of these structures are calculated with the elastic energy discribed by Keating model. Form the equation of state, the anelting temperatures are estimated. The melting temperatures of Si4 and Si6 are relatively high.
LATTICE VIBRATIONS AND FORCE CONSTANTS OF Cu(100), (111), (110) SURFACES
Authors: LUO NING-SHENG  , XU WEN-LAN  ,   中国科学院上海技术物理研究所红外物理开放实验室
Published: November 2020

We had obtained the semiempirical functions for describing the interaction properties in the ground state of Cu by using the Embedded Atom Method (EAM). In this work, The formula of surface Yorce constants between planes are derived, the force constants between planes of Cu (100), (111) and (110) surfaces are then calculated, which show that the EAM can distinguish the difference of interatomic interactions in the bulk and near the surface, and distinguish the difference of interatomic interactions near different structural surfaces. The calculated force constants lead to good agreement between the projected state densities of surface vibrations calculated by Recursion Method and the experimental results of electron-energy-loss-spectroscopy.
CURRENT TRANSPORT MECHENISM IN THERMAL-LYNITRIDED SiO2 THIN FILMS
Authors: CHANG XUE-REN  , LIU BAI-YONG  , CHEN DOU-NAN  ,   华南理工大学物理系
Published: November 2020

A new trap-assisted two-step tunneling model is proposed to explain the conduction enhancement characteristics and conduction mechanism in heavily-nitrided oxide films. A theoretical calculation is carried out to fit the theory to the experimental results. The trap density and trap energy level are found to be in the range of 1.2×1019-7.2×1020cm-3 and 2.46-2.56 eV respectively. These results agree satisfactorily with the Auger spectroscopic data. Furthermore, this model can also be applied MNOS structure or MIS devices with other traps.
NODAL-CURVE OF MATRIX ELEMENT FOR GENERALIZED OSCILLATOR STRENGTH DENSITY
Authors: TONG XIAO-MIN  , YANG LI  , LI JIA-MING  ,   (1)中国高等科学技术中心(世界实验室)理论物理分中心; (2)中国科学院物理研究所
Published: November 2020

Generalized oscillator strength density from an initial atomic state nl to final states n＇l＇ or ∈＇l＇ forming a final channel is a function of the energy transfer ∈ and the momentum transfer q. We report our study on the nodal curves in the ∈-q plane, where the matrix element for the generalized oscillator strength density vanishes. For high momentum transfer, the positions of the nodal curves can be obtained by scaling the hydrogenic results. For low momentum transfer, the nodal curves depend strongly on the difference of the quantum defects △μ of the initial and final channels; the topology of the nodal curves for △μ>0 is completely different from the topology for △μ<0.