bluuebunny/crossref_metadata_2025 huggingface dataset:
TWO NEW ION PAIR STATES IN "E" REGION OF IODINE
Authors: MIN ZHI-YUAN  , LI CHONG-DE  , WANG JIA-MIN  , GONG SHUN-SHENG  ,   (1)南京大学化学系,南京210008; (2)中国科学院武汉物理研究所,武汉430071
Published: December 2020

Pulsed OODR technique is applied to investigate ion-pair states in "E" region of iodine. The total excitation energy ranges between 43180 and 43600cm-1 Two ion-pair states, E1(13≤V′(E1)≤17) and E2(15≤V′(E2)≤19) unknown previously are found. T(e1)=41909.13±1.786cm-1,T(e2)=41843±0.033cm-1 (relative to VX= 0, J″x = 0,X1∑oe+). Analysis of the results leads to the conclusion that their energy curves (I+ 3P2+I- 1S0) are lower in "E" region as compared with others (e.g.fOg+) and both are of g symmetry.
DEPOSITION OF LARGE AREA SUPERCONDUCTING FILMS BY EXCIMER LASER SCANNING ABLATION
Authors: SONG WEN-DONG  , AN CHENG-WU  , LU DONG-SHENG  , FAN YONG-CHANG  , LI ZAI-GUANG  , HUANG JING-QING  , ZHONG HONG-HAI  , ZHAO XING-RONG  , MAI ZHI-HONG  , ZHOU FANG-QIAO  , GUO QING-WEI  , LI YUE-NAN  , HUA ZHI-QIANG  ,   (1)北京有色金属研究总院超导材料研究中心,北京100088; (2)华中理工大学光电子工程系,武汉430074; (3)华中理工大学激光技术国家重点实验室,武汉430074; (4)中国广州分析测试中心,广州510070
Published: December 2020

Using a special optical transmission system, excimer laser beam can scan on the superconducting target, scanning laser beam ablates the target resulting in deposition of superconducting films. The thickness uniformity of large area superconducting films can be improved by this method. The superconducting films on 12mm×33mm Y-ZrO2 substrates show good thickness uniformity, zero resistance temperature Tc≥90K, critical current density at 77K and zero field Jc≥l×106A/cm2.
A NUMERICAL STUDY FOR LOW ENERGY PARAMETERS OF THE TWO-DIMENSIONAL HEISENBERG ANTIFERROMAGNET
Authors: YING HE-PING  , U. J. WIESE  ,   (1)Institute for Theoretical Physics,University of Bern CH-3012 Bern,Switzerland; (2)浙江近代物理中心,浙江大学物理系,杭州310027
Published: December 2020

A Monte Carlo simulation study for the two-dimensional antiferromagnetic s=1/2 quantum Heisenberg model is performed using an efficient cluster algorithm developed by present authors. Comparing the finite temperature and finite size effects of various quantities with recent results from the chiral perturbation theory we determine the low energy parameters of the system very precisely. We find that e0= -0. 6693(1)J/a2 for the ground state energy density, Ms= 0.3076(4)/a2 for the staggered magnetization, ?c = 1.68(l)Ja for the spin-wave velocity and ρs= 0.185(5)J for the spin stiffness. Our results agree with the experimental data for the undoped precursor insulators of La2CuO4.
PHASE TRANSITION IN FERROELECTRIC FILMS WITH DOMAIN STRUCTURE
Authors: WANG CHUN-LEI  , ZHONG WEI-LIE  , ZHANG PEI-LIN  ,   山东大学物理系,济南250100
Published: December 2020

The phase transition characteristics of ferroelectric films with domain structure were studied using Landau free energy expansion. The existence of domain walls reduces both the spontaneous polarization and the Curie temperature, and increases the critical size. The reversal length moves away from the surfaces as temperature increases. As the film becomes thinner, the film will turn into single domain.
MONTE CARLO SIMULATIONS OF THE ISING MODEL ON THREE-DIMENSIONAL RANDOM LATTICE USING THE CLUSTER ALGORITHM
Authors: JI DA-REN  , ZHANG JIAN-BO  ,   (1)浙江大学,杭州310027; (2)浙江近代物理中心,杭州310027
Published: December 2020

In order to reduce the critical slowing down in Monte Carlo simulations, a numerical study for the Ising model on 3-D random lattice using Swendsen-Wang algorithm is performed. The critical point obtained is βc=0. 075±0. 001. Moreover, to analyse the dynamical property of Swendsen-Wang method, the dynamical critical exponent z is estimated. The result is z =0. 74 ±0. 03. This indicates that the Swendsen-Wang method can greatly reduce the critical slowing down for the Ising model on 3-D random lattice.
ENERGY TRANSFER IN COLLISIONS BETWEEN TWO EXCITED CESIUM ATOMS
Authors: SHEN YI-FAN  , LI WAN-XING  ,   新疆大学物理系,乌鲁木齐830046
Published: December 2020

Cesium molecules are pumped by a CW dye laser. Some of the excited molecules then pre-dissociate or collisionally transfer excitation to produce excited atoms at the 5D and 6P levels. The cross sections (in units of 10-14cm2) for the excitation transfer process Cs(6P)+Cs(5D) →Cs(7DJ)+Cs(6S)for J being 5/2 and 3/2 are 5. 4 ± 50% and 4. 9 ± 50%, respectively. The cross sections (in units of 10-14cm2) for the excitation transfer out of the 7D doublet [i. e. , Cs(7DJ)+Cs(6S) →states other than Cs(7D)] for J being 5/2 and 3/2 are 1. 6 ±50% and 0. 34±50%, respectively. To obtain these cross sections, the intensities of 7D and 5D fluorescence emissions and the 6P atom density are measured by using the absorption equivalent width technique. The results are discussed in eomparison with those of other experiments.
STUDY OF RAMAN SPECTRA FOR CRYSTALS WITH SPACE GROUP P3121(D34)( I )——RAMAN SPECTRA OF TWO-COMPONENT PIEZOELECTRIC SINGLE CRYSTAL Al1-xGaxPO4
Authors: XIA HAI-RUI  , QIN ZI-KAI  , LI LI-XIA  , ZOU ZHI-QIANG  ,   (1)山东大学实验中心,济南250100; (2)山东大学物理系,济南250100
Published: December 2020

The Raman spectra of two-component piezoelectric single crystal alumimium gallium phosphate A11-xGaxPO4(x=0.12) (AGP) have been obtained. and it has beeh shown that the red shifted spectrum lines exceed blue shifted ones in number and the TO/LO splittings for E modes decreases obviously in comparison with that of α-AlPO4. These features are interpreted in terms of lattice dynamics.
PHOTO-INDUCED ULTRATAST PROCESS OF RELAXATION IN POLYMER
Authors: YU ZHI-GANG  , HUANG QING-FENG  , SUN XIN  ,   (1)复旦大学物理系,上海200433; (2)红外物理国家重点实验室; (3)中国科学院上海技术物理研究所,上海200083
Published: December 2020

On the basis of multi-phonon transition theory, the origin of the fast component(100 fs) and the slow component (ns) in photo-excitation dynamics is explained and their evolution time is calculated. From these results, it is seen that the fast component is due to the formation of neutral bipolaron from free electron-hole pair, and the slow one is due to the non-radiative decay of bipolaron. The equations motion of the lattice are also integrated in real time to simulate the formation of bipolaron.
AN EFFICIENT CLUSTER ALGORITHM AND THE STUDY FOR THE TWO-DIMENSIONAL QUANTUM HEISENBERG ANTIFERROMAGNET
Authors: YING HE-PING  , JI DA-REN  ,   (1)浙江大学物理系,杭州310027; (2)浙江近代物理中心,杭州310027
Published: December 2020

We develop a new type of cluster algorithm that strongly reduces the critical slowing down and the frustration effect in Monte Carlo simulations of the 2D quantum antiferro-magnet Heisenberg model (AFMH). The results obtained show that the method can be applied efficiently for the study of the 2D AFMH at lower temperatures.
STUDY ON THE STRIP-LINE TRANSMISSION SPECTRA OF p-PbTe
Authors: LU WEI  , LIU PU-LIN  , SHEN XUE-CHU  , M. VON ORTENBERG  , W. DOBROWOLSKI  ,   (1)IFPANWarsaw,Poland; (2)Institut fur Halbleiterphysik und Optik,TU Braunschweig,F. R. Germany; (3)中国科学院红外物理国家实验室;中国科学院上海技术物理研究所,上海200083
Published: December 2020

The transmission spectra of p-PbTe have been measured by the strip-line technique with different far infrared laser wavelengths at different anhgles of the direction of maqnetic field relative to the crystal axis at low temperature of 1.5 k. A strong influence of mode coupling on strip-line transmission spectra has been observed and analyzed. The final results extracted from experimental spectra by numerical simulation are in good agreement with the six band k·p model calculation.
LASERS WITHOUT INVERSION VIA OPTICAL PUMPING
Authors: HU XIANG-MING  ,   华中师范大学应用物理研究所,武汉430070
Published: December 2020

Both nondegenerate Λ-and V-type laser systems can produce lasers without inversion via optical pumping.
A SUPERCELL LMTO-ASA CALCULATION OF GROUND-STATE PROPERTIES OF Nb(C1-x□x)
Authors: LI JUN-DA  , SHEN YAO-WEN  , HUANG MEI-CHUN  ,   厦门大学物理系,厦门361005
Published: December 2020

The ground-state properties of Nb(C1-x□x) have been calculated by using a LDF-LM-TO-ASA supercell method. The calculation was performed by quadruple unit-cell such as Nb4C3□0, Nb4C3□1, Nb4C2□2 ,Nb4C1□3 and Nb4C0□4. The equilibrium lattice constant a(x) , bulkmoduli B(x), Debye temperatures θD(x) and heat of formation h (x) obtained from LM-TO calculation were combined with Bernoull's distribution. These results are in agreement with experimental data.
ELECTRON CORRELATION EFFECT IN THE HUBBARD-HIRSCH MODEL
Authors: WEI GUO-ZHU  ,   东北大学物理系
Published: December 2020

Based on the single-site electron correlation, the local approach has been used to investigate the ferromagnetic phase in the Hubbard-Hirsch model. Using the R =0,α approximation in second-order calculation, the electron Correlation effect on the phase diagram has been studied Carefully. Comparing with those of the R=0 approximation, the electron correlation effect becomes weaker due to taking into aceount the nondiagonal elements of density matrix.
THEORETICAL MODEL TO NON-LOCATION ABSORPTION FOR OBLIQUELY INCIDENT HIGH POWER LASER COUPLING WITH HIGH Z TARGETS
Authors: ZHANG JUN  , PEI WEN-BING  , GU PEI-JUN  , CHANG TIE-QIANG  ,   北京应用物理与计算数学研究所,北京100088
Published: December 2020

With the assumption of 1-D density distribution and geometric light path,the absorption coupling Nd-glass laser with Au targets have been computed consistently; the variation laws of laser absorption efficiency with incident angle, intensity, and waveleng
PHOTOVALTAIC EFFECT IN MPS STRUCTURE
Authors: WANG YAN  , YUN FENG  , LIAO XIAN-BO  , KONG GUANG-LIN  ,   中国科学院半导体研究所
Published: December 2020

In this paper, we report the recent results about photovoltaic effects in a metal (Al or Au)/porous silicon(MPS)structure. We have given the spectral response curves of the Schottky diode structures of the first time, and investigated the dependences of the open circuit voltage on the incident light intensity and the measurement temperature. The results obtained show that the Schottky junction between the metal and the porous silicon layer should be the principal source of the photovoltaic actions, while the heterojunction between the porous silicon layer and the silicon substrate could impede the transport of the forward current in this structures. It is also found that the open circuit voltage increases linearly with decreasing of temperature in the range of 300—120K and the temperature coefficient is ～2.0mV/K and ～2.8mV/K for Au/PS and Al/PS diodes, respectively.
A NEW DESIGN METHOD OF DIFFRACTIVE PHASE ELEMENTS FOR GENERATING MULTI-FOCAL ANNULI
Authors: ZHANG GUO-QING  , GU BEN-YUAN  , YANG GUO-ZHEN  ,   中国科学院物理研究所
Published: December 2020

Based on the general theory of the optical transformation, a new method for designing diffractive phase elements generating multi-focal annuli is presented. The number and the position of focal annuli, as well as the width of focal annuli may be predetermined arbitrarily according to the particular demands. Several simulation designs are carried out for the Gaus-sian-profile laser illumination. We also investigate the influence of phase quantization on the results of designs. The simulation calculations show that the new method can be successfully applied to the designs of the desired diffractive phase elements for generating multi-focal annuli.
STUDY OF SOFT X-RAY CONVERSION EFFICIENCY FROM FREQUENCY-TRIPLED 0.35μｍ LASER-IRRADIATED DIFFERENT MATERIAL PLANAR TARGETS
Authors: MA HONG-LIANG  , SUN KE-XU  , YI RONG-QING  , CUI YAN-LI  , TANG DAO-YUAN  , ZHENG ZHI-JIAN  ,   (1)复旦大学李政道物理学综合实验室原子核科学系; (2)西南核物理与化学研究所
Published: December 2020

Soft X-ray conversion efficiencies from 0.35μｍ laser-irradiated Au disk and C, Al, Cu foils at different laser intensity on the "Xingguang Ⅱ" high-intensity laser facility (energy ５—９０Ｊ，focal spot～２００μｍ，FWHM４００—８００ｐｓ）were obtained. A simple model was given to explain soft X-ray conversion efficiency from ０.３５μｍ laser-Al plasma interaction. In this model,bccause of heat conduction from the laser-heated spot, the conversion was very small at some low irradiancc limit, while at some high irradiance limit it was bounded by the energy lost in plasma blowoff. Consequently, at laser intensity(2±0.5)×１０１4Ｗ／ｃｍ2,the X-ray conversion efficiency reaches a maximum.
MEASUREMENT OF DENSITY FLUCTUATIONS OF CT-6B TOKAMAK PLASMA
Authors: DONG LI-FANG  , WANG LONG  , LI ZAN-LIANG  ,   中国科学院物理研究所
Published: December 2020

The electron density fluctuations of CT-6B Tokamak plasma have been studied in detail through the observation of Hα emission intensity by multichannel optical diagnostics. Their various behavior, such as power spectrum, fluctuation level and correlation,have been measured. The experimental results show that some characteristics of density fluctuations are founded in CT-6B Tokamak plasma: the density fluctuation level is about 10%-90% in the radial range r=4-10cm; the point in the range draws, nearer to the edge of plasma the level lecomes higher. A broadband power spectrum is observed at observed points along the plasma radius. There exists a local correlation structure with short correlation time, about 0.2-0.5ms, and short correlation distance , about 0.5-1cm,in the edge of plasma.
INTERLAYER COUPLING AND MAGNETORESISTANT EFFECT IN THE [Fe/Cr] MULTILAYERS DOPED WITH Si LAYERS
Authors: HU YONG-JIAN  , PENG CHU-BING  , FANG RUI-YI  , LI WEI-JUN  , DAI DAO-SHENG  ,   北京大学物理系
Published: December 2020

[Fe/Cr],[Fe/Cr/Si] and [Fe/Si] multilayered systems were prepared by the vacuum evaporating method. The effects of the altered space thicknesses of the nonmagnetic Cr,Si and Cr+Si layers on the exchange coupling and the magneto resistance of those multilayers were studied. The Fe layers were fixed on 2.0nm. The oscillation of the interlayer coupling and the giant magnetoresistance (GMR) and its oscillation with the change of the Cr layer thickness were observed. The GMR was 14.6% at 4.2K. Three was no oscillatory effect of the exchange coupling and GMR in the [Fe/Si] and [Fe/Cr/Si] multilayers was found. According to the increases of the resistivity of the samples doped with Si layers, we believe the conducting electrons in the nonmagnetic layers should decrease largely. This would be the cause to reduce the polarization effect of those electrons in the space layers. Then the oscillatory exchange coupling disappeared and the magnetoresistance was much reduced.
ARTIFACTS IN 2D NMR NOESY SPECTRA OF WATER DUE TO RADIATION DAMPING
Authors: GUO JIAN-XIN  , MAO XI-AN  ,   中国科学院武汉物理研究所波谱与原子分子物理国家重点实验室
Published: December 2020

Harmonic peaks appearing in ω1 dimension of the NOESY spectra on liquid water are sidcussed. The NOESY experiment is analuzed by using radiation damping line shape theory and the result shows that these harmonic peaks are artifacts induced by radiation damping. It is also shown that the line shapes of the artifacts are dependent on the mixing time,in good agreement with the experimental results. Some methods for eliminating these artifacts are proposed.
SEMICLASSICAL THEORY OF RAMAN FREE-ELECTRON LASERS
Authors: LI ZHI-KUAN  ,   承德民族师范高等专科学校物理系
Published: December 2020

In this paper, we point out that the problem of a system of many particles can be simplified into that of a single electron by using Thomas-Fermi potential in Raman free-electron lasers. Klein-Gordon equation is solved by using perturbation theory. The formula of the density of electric charge and current density are derived from the corresponding zero order wave function. If we simplify properly the Klein-Gordon equation, we can solved by using the methods of seperation of variables and WKB approximation. We also derived the formula of the electric charge and current density which correspond to the new wave function.
A STUDY ON THE PEIERLS TRANSITIONS OF BLUE BRONZE K0.3MoO3 SINGLE CRYSTAL
Authors: YIN JIANG  , DOU AO-CHUAN  , LIU ZHI-GUO  , FENG DUAN  ,   (1)南京大学固体微结构物理国家重点实验室; (2)镇江师范专科学校物理系
Published: December 2020

K0.3MoO3 single crystals with the size of 2cm×1.5cm×1cm have been grown by electrolytic reduction of K2CO3-MoO3 melt with a K2CO3-to-MoO3 mole ratio of 1 to 4.32. The temperature dependence of normalized resistivity R(T)/R(290K)-T of a K0.3MoO3 single crystal has been determined. It is found that the semiconductor gap of the single crystal is 1320K(0.11eV). The threshold electric field ET is ０.1２９Ｖ／ｃｍ derived from the data of nonlinear conductivity at T=77K．ＤＳＣ study of the samples shows that the K0.3MoO3 single crystal undertakes a new Peierls phase transition around 240K and that the phase transition is of first order. The Δｃp-Ｔ curve shows that the phase transition around T=180K is a combination of a second order and a first.
IMPROVING THE DIRECT METHOD FOR SOLVING SUPERSTRUCTURES
Authors: GU YUAN-XIN  ,   中国科学院物理研究所
Published: December 2020

Direct methods have been proved to be effective and objective for solving superstructures. Two algorithms have been proposed to further improve the efficiency. The first was the same number of E's in all reflection groups. The second was a set of artificial E's in phase derivation to eliminate the effect from abnormal distribution of E values. The new algorithms have been incorporated into new version of SAPI.
ANALYSIS OF DEFECT STRUCTURE IN Mg-DOPED LiNbO3 CRYSTAL
Authors: LIU JIAN-JUN  , ZHANG WAN-LIN  , ZHANG GUANG-YIN  ,   南开大学物理系
Published: December 2020

According to the Li vacancy model of intrinsic defect in LiNbO3 the defect structures formed in LiNbO3:Mg with varying Mg contents are proposed. The Ｌｉ２Ｏ，Ｎｂ２Ｏ5 contents ［Ｌｉ］／［Ｎｂ］ ratio, in crystals and the densities of the crystals are calculated by using the defect models. The calculated calues are in good agreement with the experimental results.
FERMI AND NON-FERMI LIQUID BEHAVIOR OF THE MULTICHANNEL RESONANT-LEVEL MODEL
Authors: YUAN QING-SHAN  , CHEN HONG  , ZHANG YU-MEI  ,   同济大学波耳固体物理研究所
Published: December 2020

In this paper we have transformed the three-dimensional multichannel resonant-level model into one-dimensional model using ths s-wave scattering approximation, and then map it onto a single channel Kondo model at the operator level by use of a bosonization technique. The specific heat has been calculated and the Fermi and non-Fermi liquid behavior of the system have been discussed for two fixed point Hamiltonians.
THE ELECTRONIC STRUCTURE AND STRUCTURE STABILITY OF Ａｇ（１１１） AND Ａｇ（00１） SURFACES
Authors: ZHANG HAI-FENG  , LI YONG-PING  , PAN BI-CAI  ,   (1)中国科学技术大学材料科学与工程系; (2)中国科学技术大学物理系
Published: December 2020

By using the Linearized Muffin-Tin Orbital Method, the surface electronic structure of several "stable Ａｇ（１１１） surfaces" obtained by different methods were systematically studied and contrasted, the different surface electronic character of the different relaxation surfaces were presented and discussed. According to the surface energy, the most stable Ａｇ（１１１） surface was single layer inward relaxed surface, and the local electronic densities of states of this king of structure were presented and discussed. The local electronic dendities of states of ideal clean Ａｇ（00１） surface were also studied, and the results that the Ａｇ（00１） surface were also presented. the Ａｇ（００１） surface is more stable than Ａｇ（１１１）.
SRPES STUDY OF THE Sm/Si(100) INTERFACE FORMATION AND ELECTRONIC STRUCTURES
Authors: XU SHI-HONG  , LU ER-DONG  , YU XIAO-JIANG  , PAN HAI-BIN  , ZHANG FA-PEI  , XU PENG-SHOU  ,   (1)中国科学技术大学国家同步辐射实验室; (2)中国科学技术大学结构分析开放研究实验室
Published: December 2020

The behavior of interface formed by growing this Sm film on the Ｓｉ（１００）２×１ substrate at room temperature has been investigated by cove level and valence band photoemission using synchrotron radiation. The experimental results show the existence of distinct stages corresponding to chemisorption and agglomeration of Sm atoms（coverage Θ＜０.５ＭＬ）,reactive interdiffusion （０.５ＭＬ≤Θ≤４—６ＭＬ）, and growth of metallic Sm. Compared to Ｓｉ（１１１）７×７ the reactivity of Sm on the Ｓｉ（１００）２×１ substrate is enhanced and a greater tendency for interdiffusion of Sm and Si is observed. Also we have discussed the interface formation and the interface profile carefully.
TWO EXACTLY SOLVABLE POTENTIALS FOR DIATOMIC MOLECULES
Authors: SUN JIU-XUN  , ZHANG LI-YUAN  ,   北京大学物理系
Published: December 2020

We present a new potential function with an exactly solvable Ｓｃｈｒ?ｄｉｎｇｅｒ equation. At the same time, we propose a new variable transformation to show that the hyperbolic Ｐ?ｓｃｈｌ-Ｔｅｌｅｒ molecular potential is also exactly solvable. The form of the solutions is not only closed, but also very simple. The normalized wave functions are expressed by the hypergeometric series. All the results of the Hulthéｎ potential and the modified Ｐ?ｓｃｈｌ-Ｔｅｌｅｒ potential as well as the reflectionless potential in the existing literature are contained in the more general conclusions of this paper as special cases. Finally, practical applications of the potentials in this paper to diatomic molecules are discussed.
NEW CRISES DUE TO DYNAMICAL DISCONTINUITY
Authors: SUN JIAN-GANG  , GUAN SHAN  , JI XI-PING  , HE DA-REN  , WANG BING-HONG  , QU SHI-XIAN  ,   (1)西安石油学院基础部; (2)西北大学物理系; (3)中国科学技术大学近代物理系
Published: December 2020

We have observed crises with new characteristics induced by discontinuity in a one-dimensional discontinuous map describing relaxation oscillators. There are four critical lines characterizing different types of new crises in the parameter plane(Id,Ii). These have a common convergence at a non-differentiable vertex, near which a small parameter perturbation may induce drastic dynamical changes of the system.
THEORETICAL STUDY OF THE FINE-STRUCTURE INVERSIONS IN nf RYDBERG STATES OF ALKALI ATOMS
Authors: YAN JUN  , ZHANG PEI-HONG  , TONG XIAO-MIN  , LI JIA-MING  ,   中国科学院物理研究所
Published: December 2020

Based on the Relativistic Multichannel Theory,we have systematically studied the fine structure of nf Rydberg states of alkali atoms. Our calculated differences between the quantum defects μj+ and μj- are in good agreement with measured values, namely normal for Li and Na while inverted for Rb and Cs. We also predict a normal fine-structure for K and an inverted one for Fr, which still have no experimental data currently. Our theoretical calculation shows that the exchange between excited electron and core electrons is responsible for the inversion, which is a purely relativistic effect, while electron correlation is unimportant.
BOND LENGTHS OF BUCKY-BALLS WITH HIGH SYMMETRY
Authors: LIU LEI  , LIN XIN-HAO  , LI YU-FEN  , ZHANG JIAN-GUO  , CUI YUN-LONG  , ZHU ZHI-YUAN  ,   (1)复旦大学李政道物理学综合实验室，复旦大学物理系; (2)中国科学院原子核物理研究所
Published: December 2020

Based on an empirical potential,we have performed calculations of bond lengths of carbon bucky-balls with high symmetry. Bond length of a monolayer graphite, considered as an extremely large bucky-ball, has also been calculated. The calculated bond lengths of single bonds and double bonds dectrease and increase with increasing bucky-ball size, respectively, and both smoothly connects with the corresponding value of the monolayer graphite.
PHOTOREFRACTIVE ASYMMETRICAL SELF-DEFOCUSING INDUCED BY THERMAL SELF-FOCUSING
Authors: SHE WEI-LONG  , HE SUI-RONG  , WANG HE-ZHOU  , YU ZHEN-XIN  , MO DANG  ,   (1)中山大学超快速激光光谱学国家重点实验室; (2)中山大学物理系
Published: December 2020

The phenomenon of photorefractive asymmetrical self-defocusing induced by thermal self-focusing is observed when a Gaussian beam at 532nm with high enough intensity is focused onto a KNSBN crystal. The spatial distribution and physical properties of the asymmetrical self-defocusing are different from those of stimulated noise scattering. It is found that asymmetrical self-defocusing has no contribution to self-pumped phase conjugation. The diameter of the beam when asymmetrical self-defocusing first appears in the crystal is estimated.
DIODE-LASER BEAM CONVERSION WITH DIFFRACTIVE OPTICAL ELEMENTS
Authors: JI YANG  , ZHANG JING-JUAN  , YAO DE-CHENG  , CHEN YAN-SONG  ,   (1)中国科学技术大学研究生院; (2)中国科学院物理研究所
Published: December 2020

A pair of diffractive optical elements are desinged to implement the wavefront transformation from an elliptical-gaussian beam to a flat-top circular beam,with the aid of a new algorithm (SAIO) composed of a simulated annealing algorithm (SA) and an input-output(IO) algorithm. The energy transformation efficiency is up to 91.9%. SAIO performs better than SA or IO alone.
ELECTRONIC STRUCTURE OF ALKALI-METALS ADSORBED ON CdTe(111) SURFACES
Authors: ZHANG HAI-FENG  , LI YONG-PING  , FANG RONG-CHUAN  , BAN DA-YAN  ,   (1)冶金工业部钢铁研究总院; (2)中国科学技术大学物理系
Published: December 2020

The electronic structure of CdTe(111) surfaces with adsorbed alkali metals has been explored by synchrotron radiation and LMTO method. The experimental results showed that the surface states were redistributed when K-adsorbed and Fermi-pinning phenomena appeared. Theoretical calculations of K adsorbed on CdTe(111) surfaces agree well with the experiment. A systematic study of alkali metals adsorbed on CdTe(111) surfaces showed that the electronic structure characteristics not only depend on the atomic number of the alkali metals, but are also related to the core electron configurations.
BOTH THE ENTROPY CHANGE AND THE TEMPERATURE OF BLACK HOLES ARE THE COMPENSATE EFFECT UNDER THE TIME-SCALE TRANSFORMATION
Authors: ZHAO ZHENG  , LI ZHONG-HENG  ,   (1)北京师范大学物理系; (2)湛江师范学院物理系
Published: December 2020

The compensate effect under the time-scale transformation for the Schwarzschild black hole and Vaidya black hole are studied. The gauge potential is the contraction of the affine connection. Both the Hawking temperature and the change of entropy of black holes can be regarded as the pure-gauge potentials of the compensate field.
OPTIMIZATION OF Tc IN EPITAXIAL GdBaCuO SUPERCONDUCTING THIN FILM BY INVERTED CYLINDRICAL SPUTTERING
Authors: LI YAN-RONG  , LIU XIN-ZHAO  , XU JIN  , J.GEERK  , R.SMITHY  ,   (1)INFP,Forschungszentrum Karlsruhe,D 76021,Germany; (2)电子科技大学信息材料工程学院
Published: December 2020

Thin films of GdBaCuO(GBCO) compound have been deposited in situ onto LaAlO3 single crystal substrates by inverted cylindrical sputtering.The variation of superconductive properties of the thin films with the substrate temperature and sputtering pressure has been systematic investigated.By the optimization of deposition parameter,high quality c-axis epitaxial GBCO thin films of Tc0>92K were reproducibly grown at the substrate temperature of 720—820℃ with a low deposition total pressure (40Pa).The Tc0 of the best sample is as high as 93.2K.Only by changing the target composition into GdBa2Cu4Oy (Gd124),was it observed that the samples always contain some a-axis oriented films,impling that excess copper would favour a-axis growth in thin films,and the Tc of the samples is lower than that with Gd123 target.The superconductivity of the thin films under high substrate temperature was clearly improved by the procedure of special post oxygenization at 400℃ in ozone atmosphere.These results are very useful to further prepare large area thin films of GBCO.
A NEW METHOD FOR POST TREATMENT OF POROUS SILICON:SULFUR PASSIVATION BY MICROWAVE PLASMA ASSISTANCE
Authors: LIU XIAO-BING  , XIONG ZU-HONG  , YUAN SHUAI  , LIAO LIANG-SHENG  , HE JUN  , CAO XIAN-AN  , MIAO XI-YUE  , DING XUN-MIN  , HOU XIAO-YUAN  ,   (1)长沙电力学院物理系; (2)复旦大学应用表面物理国家重点实验室李政道物理学综合实验室
Published: December 2020

A new method for post-treatment of PS(porous silicon), sulfur passivation by microwave plasma assistance in vacuum,is reported in this paper.Fourier transform infrared spectrum indicated that the treated sample surface is mainly covered by SiSx and SiOy.Compared with the as etched PS,the photoluminescence (PL) intensity of the sample is 3.5 times stronger,and the 4nm blueshift of the PL peak was observed experimentally;furthermore,the intensity decay of the PL peak hasnot been observed after 60d in the atmosphere.Therefore,sulfur passivation is an effective post treatment for enhancing PL intensity and stabilization of PS.
MAGNETIC INTERFERE TO THE COLLISION-DEPOPULATION AND DISALIGNMENT OF ArI5p2
Authors: ZHENG YIN-DONG  , LI ZHENG-ZHI  ,   (1)杭州大学物理系; (2)杭州大学中心实验室
Published: December 2020

In hollow cathode discharge laser induced fluorescence experiment,when a strong external magnetic field is applied in the direction of observation and “magic angle” excitation method is adopted,to ArI5p[3/2]2,we find that the stronger the magnetic field,the faster the collision depopulation rates,but the slower the collision disalignment rates.On the whole,the decay rates of the curves become slower with the increase of the magnetic field strength.The natural lifetime of ArI5p[3/2]2 was measured to be 120±5ns under the condition without an external magnetic field.
SMALL SIGNAL ANALYSIS OF WAVELENGTH CONVERSION IN SEMICONDUCTOR LASER AMPLIFIERS BASED ON GAIN SATURATION
Authors: SUN JUN-QIANG  , HUANG DE-XIU  , YI HE-QING  ,   (1)华中理工大学光电子工程系; (2)武汉邮电科学研究院
Published: December 2020

Wavelength conversion due to gain saturation in a semiconductor laser amplifier(SLA) is theoretically analyzed and also-studied experimentally based on small signal model.An analytic expression is developed describing the relationship between-conversion efficiency and characteristic parameters of SLA. The numerical simulation results show that the frequency response of the converter is not only limited to the carrier lifetime, but also affected by the saturation power, gain and waveguide internal loss of SLA.
NUMERICAL STUDY OF ION TRANSPORT IN ECR MICROWAVE PLASMA WITH A CYLINDER MODEL
Authors: GONG YE  , WEN XIAO-JUN  , ZHANG PENG-YUN  , DENG XIN-LU  ,   大连理工大学物理系
Published: December 2020

In this paper,we use the Monte Carlo method to simulate the complete course,in which the ions pass through the neutral,sheath,and the shield regions of a virtual cathode formed by the secondary electrons near the workpiece surface,and finally are absorbed by the surface of the workpiece with negative bias in ECR microwave plasma.The nonlinear cylinder Poisson equations is solved successfully with “trial” method,and the smoothed and self limits spectrum of potential and distributions of energy and angle at the surface of workpiece are obtained.The magnetic filed,gas pressure and secondary effects on the potential of sheath are also discussed.
ELECTRONIC STRUCTURE OF As ON InP(110) SURFACE STUDIED THEORETICALLY
Authors: WANG SONG-YOU  , JIA YU  , ZHENG WEI-MIN  , MA BING-XIAN  , QIAN DONG-LIANG  , ZHENG YU-XIANG  , CHEN LIANG-YAO  ,   (1)复旦大学物理系，上海  200433; (2)郑州大学物理工程学院，郑州  450052
Published: December 2020

Based on the tight binding scattering theoretical method ,the electronic structure of As adsorption on the surface of InP(110) is studied.The bulk material is described by a realistic empirical tight binding Hamiltonians ,the translationally invariant As/InP(110)(1×1) system is discussed in terms of the ordered As monolayer and an exchange reaction between surface P and As adatoms. Surface states and surface resonances are identified from the calculated local density of states along the four zone boundaries of the (110) surface Brillouin zone .In this calculation ,some ETB parameters are adjusted at the surface, the results are in good agreement with the experiment and are better than other theoretical results.
ELECTRONIC STRUCTURE OF THE ZnSe/GaAs(100) INTERFACES
Authors: YANG SHI-E  , MA BING-XIAN  , JIA YU  , SHEN SAN-GUO  , FAN XI-QING  ,   郑州大学材料物理重点实验室，郑州  450052
Published: December 2020

We present results of a theoretical calculation of the electronic structure of the two polar ZnSe/GaAs(100) interfaces. The bulk electronic structure is described by the nearest neighbor tight binding formalism. Using the scattering theoretical method, we have obtained wave vector-resolved interface layer densities of states and the interface band structure. For both Se/Ga and As/Zn interfaces, there exist no interface states in the fundamental gap, but there are three interface bands and four semi-resonance bands in the valence-band region. Finally, we study the nature and origins of these bands by analysing orbital-resolved layer densities of states.
HIGH-PRESSURE SYNTHESIS AND SUPERCONDUCTIVITY OF NEW BULK Pr1-xCaxBa2Cu3O7-δSUPERCONDUCTORS
Authors: XIONG YU-FENG  , JIN DUO  , YAO YU-SHU  , WU FEI  , JIA SHUN-LIAN  , ZHAO ZHONG-XIAN  ,   (1)中国科学院低温技术实验中心，北京  100080; (2)中国科学院物理研究所超导国家重点实验室，北京  100080
Published: December 2020

The new bulk superconductors of Pr1-xCaxBa2Cu3O1-δ (0.4≤x≤0.6) have been synthesized under high pressure for the first time to our knowledge. The highest Tc of 98K was observed for Oxygen-deficient tetragonal Pr0.5Ca0.5Ba2Cu3O7-δ sample. Our results demonstrate the valence state of Pr in 123 structure is a mixed sate greater than 3+, hole filling and hybridization are the primary cause of the suppression of superconductivity by Pr in 123 structure.
INVESTIGATION OF ELECTRIC FIELD-INDUCED ANTIFERROELECTRIC TO FERROELECTRIC PHASE TRANSITION AND PHASE STABILITY OF PLZST CERAMICS
Authors: LIU PENG  , YANG TONG-QING  , WANG ZHI-HONG  , XU ZHUO  , ZHANG LIANG-YING  , YAO XI  ,   西安交通大学电子材料与器电研究所，西安  710049
Published: December 2020

We have prepared antiferroelectric ceramics with compositions of (Pb0.97La0.02)(Zr1-x-ySnyTix)O3(x=0.09 or 0.1; 0.16≤y≤0.38) near antiferroelectric (AFE)tetragonal-ferroelectric (FE)rhombohedral morphotropic phase boundary. The effects of Sn content on electric field-induced AFE→FE switching field Ec, double-hysteresis-loop width ΔE, and temperature-induced FE→AFE phase transition temperature TFE, AFE→paraelectric (PE) transition temperature Tc are investigated. At constant Ti content x, both TEF and Tc decrease with increase of Sn content y. Electric hysteresis loop measurement demonstrates an increase of Ec and decrease of ΔE when Sn content y　increases. Furthermore, we also find that Ec and ΔE are related with TFE and Tc. In situ X-ray diffraction under dc bias field shows that symmetry changes from tetragonal phase to rhombohedral phase with an increase of c axis,and an increase of lattice volume.
ANGULAR DISTRIBUTIONS IN THE LOW-ENERGY (e,2e) REACTION OF Li+
Authors: JIA XIANG-FU  , YAND WEI  ,   山西师范大学特理系，信息网格中心,临汾 041004
Published: December 2020

Based on the BBK theory, triple differential cross sections (TDCS) have been calculated for ionization of Li+ (1s2) by electron impact. A coplanar, equal-energy, fixed-relative angle kinematics is chosen and the particular case where the scattered and ionized electrons emerge perpendicular to each other is emphasized The incoming electron state is considered by a Coulomb wave from the long-range attraction between the incident electron and the screened ionic nucleus or approximated by a plane wave. It is shown that the maximum probability for emission near threshold is a configuration in which the interelectronic vector is aligned along the beam direction and the minimum probability when this vector is perpendicular to the beam, and that the initial channel Coulomb field play a major role in determining the TDCS at near threshold energy.
ANOMALOUS TRANSMISSION OF X-RAYS UNDER ASYMMETRICAL REFLECTION CONDITION NEAR THE ABSORPTION EDGE
Authors: XU ZHANG-CHENG  , GUO CHANG-LIN  , ZHAO ZONG-YAN  , T.FUKAMACHI  , R.NEGISHI  ,   (1)安徽大学物理系，合肥 230039; (2)日本畸玉工业大学电子工学科，琦玉,冈部 369-02; (3)中国科学院上海硅酸盐研究所，上海  200050
Published: December 2020

Anomalous transmission of X-rays for plance-parallel perfect crystals under asymmetrical Bragg reflection condition near the atomic absorption edge is studied in detail. When diffraction is induced mainly by the imaginary part of atomic scattering factor, the nodes of the standing wave within the crystal lie on the atomic plane at the exact Bragg angle, which results in an anomalous transmission. The transmitted beam comes mainly from the wave-field with its Poynting vector Poynting toward the lower surface of the crystal (the entrance surface being the upper one). The effective absorption coefficient of this wave-field decreases with the asymmetrical factor a. Therefore, the transmitted coefficient of the whole crystal increases as a increases. For a given ratio between the contributions of the real and imaginary parts of atomic scattering factor to diffraction, the deviation of Poynting vector from the normal of the real part of the dispersion surface increases with the degree of asymmetrical reflection condition.
THE MANIPULATION OF A SINGLE AL ATOM ON AL (111) SURFACE
Authors: WANG FU-HE  , YANG JIN-LONG  , LI JIA-MING  ,   (1)清华大学现代应用物理系单原子分子测控科学中心,北京 100084；中国科学院物理研究所,北京 100080; (2)中国科学技术大学基础物理中心，合肥 230026
Published: December 2020

In order to elucidate the action of the STM tip in the manipulation of atom on a sample surface, the interaction between W tip atom and sample Al(111) surface atom is studied with cluster model by employing the first principles method—discrete variational method. The calculated results show that if the distance S between the tip and sample surface is short enough (S≤10 a.u.), when the sample surface Al atom, which is just under the W trp, escapes from the surface, it fells a stable potential well. This indicates that even without an external field, the Al atom can be extracted from the sample surface to the tip ty the attraction of the W tip, if the tip is very close to the sample surface.
AN INCIPIENT EDGE DISLOCATION IN EPITAXIAL WURTZITE GaN
Authors: WANG SHAO-QING  , LIU QUAN-PU  , YE HENG-QIANG  ,   (1)英国剑桥大学材料科学与冶金学系,英国剑桥 CB2 3QZ; (2)中国科学院金属研究所固体原子像开放研究实验室,沈阳 110015; (3)中国科学院金属研究所固体原子像开放研究实验室,沈阳 110015;英国剑桥大学材料科学与冶金学系,英国剑桥 CB2 3QZ
Published: December 2020

A structural defect of incipient edge dislocation in epitaxial wurtzite GaN film is confirmed in this paper. The defect is observed as an isolated (1120) boundary segment within one large perfect crystal area by high-resolution electron microscopy. It has the local atom configuration as a part of (1120) high-energy like-atom bonding boundary together with two 1/6［1120］ partial edge dislocations at its two ends. The origin of the defect is explored from the mechanism of epitaxial growth.
THIN FILMS OF Sb GROWN BY MOLECULAR BEAM EPITAXY AND THE QUANTUM SIZE EFFECT
Authors: YI XIN-JIAN  , LI YI  , HAO JIAN-HUA  , ZHANG XIN-YU  , G.K.WONG  ,   (1)Materials Research Center,Northwestern University,Evanston,IL 60208,USA; (2)华中理工大学光电子工程系，武汉 430074
Published: December 2020

Thin film of Sb(111) was grown on GaAs(001) substrate by molecular beam epitaxy. The growth process of the film was characterized in-situ by reflective high energy electron diffraction and the film structure was investigated by transmission electron microscrope. The resistivity as a function of growth temperature was measured by van de Pauw method. We have observed the quantum size effect in Sb film grown on GaAs substrate.
EFFECTS OF Ti DOPING ON THE PHASE STABILITY OF α″-Fe16N2
Authors: WANG HE-YING  , JIANG EN-YONG  , ME ZHEN-WEI  , HE YUAN-JIN  ,   (1)清华大学材料科学与工程系,北京 100084; (2)清华大学现代应用物理系,北京 100084; (3)天津大学应用物理系,天津 300072
Published: December 2020

In this paper, the effect of Ti doping on the phase stability of α″-Fe16N2 was investigated. Experimental results show that appropriate Ti addition may benefit the α″-Fe16N2 phase formation. Theoretical calculation shows that the formation enthalpy of α″-(Fe,Ti)16N2 phase in (Fe,Ti)-N films is smaller than that of α″-Fe16N2 phase in Fe-N system. This suggests that the stability of α″-Fe16N2 can be enhanced by Ti addition. Therefore, the α″ alloy phase and exhibit high saturation magnetization μ0Ms=2.3—2.6T．
AN EXACT WAVEFUNCTION OF DAMPED HARMONIC OSCILLATOR
Authors: LING RUI-LIANG  , FENG JIN-FU  ,   江苏省常熟高等师范专科学校物理系，常熟  215500
Published: December 2020

A damped harmonic oscillator was studied using canonical tramsformation and starting from the method of path integrals.An exact wavefunction for the damped harmonic oscillator has been obtained from a Gaussiantype propagator.The fluctuations of displacement and momentum at zero-point are also given.
CLASSIFICATION AND OPTOELECTRONICS IMPLEMENTA-TION OF MULTI-OBJECTS WITH ROTATION INVARIANCE BASED ON RBF FUNCTION
Authors: SHEN JIN-YUAN  , LIU YUE  , CHANG SHENG-JIANG  , JIA JIA  , ZHANG WEN-WEI  , ZHANG YAN-XIN  , MU GUO-GUANG  ,   南开大学现代光学研究所，天津  300071;南开大学光学信息技术科学开放研究实验室，天津  300071
Published: December 2020

A general discrimination function and a neural network model are constructed by using RBF function.This reveals the close relation between pattern recognition and neural network.Multi-objects classification with in-plane(2-D) and out-plane(3-D) rotation invariance is implemented by using this general discrimination function and neural network model.The computer simulation shows that it is an effective method for classifying multi-objects with rotation invariance.One of the opto-electronics recognition systems is presented to implement this function and model.
HIGHER-ORDER FLUCTUATIONS IN COHERENT STATES AND SQUEEZED STATES WITH THERMAL NOISE
Authors: DONG CHUAN-HUA  ,   上海大学物理系，上海  200072
Published: December 2020

By making use of thermo-field dynamics(TFD),higher-order fluctuations and higher-order squeezing of quadrature components for coherent states and squeezed states with thermal noise have been studied.The higher-order fluctuations of the phase for these thermalized states have been investigated using the concept of measured phase operators.Thus the dependence of the lower-and higher-order fluctuations and squeezing on temperature in these states at finite temperature can be seen.It is significant to discuss the effect of temperature on the fluctuations and squeezing,since the states of real field are always at finite temperatures.
XPS INVESTIGATION OF INTERFACE CHARACTERISTICS IN Au/GaP CONTACT SYSTEM
Authors: LIN XIU-HUA  ,   厦门大学物理系，厦门  361005
Published: December 2020

The variation of interface structure and composition with heat treatment temperature in Au-GaP contact system are investigated by X-ray photo-emission spectroscopy. The experimental results show that the diffusion and migration between the metal and semiconductor have taken place even if at room temperature. Annealing of Au-GaP contact leads to GaP decomposition in the interface accompanied by rapid atomic interdiffusion. During the increase of temperature the interreaction of Au-Ga atoms is enhanced and AuGa multiphase composition compounds are formed. The interfaces of Au-GaP contact system are an alloying regrowth layer containing metal and semiconductor atoms. The temperature dependence of interface characteristics are discussed from the point of view of Metallurgy.
The Giant Magneto-Impedance Effect of Current-Annealed Fe-Based Ribbons
Authors: He Jun  , Guo Hui-Qun  , Cheng Li-Zhi  , Shen Bao-Gen  , He Kai-Yuan  , Liu Yi-Hua  ,   (1)东北大学材料科学与工程系，沈阳 110006; (2)山东大学物理系，济南 250100; (3)中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080; (4)中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080;东北大学材料科学与工程系，沈阳 110006
Published: December 2020

The influence of current annealing process on the giant magneto-impedance (GMI) effect of Fe84Zr8Nb3.5Cu1 ribbons was studied. The obtained results showed that with increasing annealing current, the GMI ratio ΔZ/Z(ΔZ/Z=(Z(H)-Z(Hmax))/Z(Hmax)) is enhanced. The maximal GMI ratio of about 62% is obtained for the sample annealed at 820 mA for 10min, while the sensitivity can reach a value up to about 0.23% (A/m)-1. In combination with the evolution of electrical and soft magnetic properties, the dependence of the GMI effect on the frequency and applied longitudinal field has been discussed by means of skin effect.
Magnetic Force Microscope Study on Quick-Quenched Ribbon Sm2Fe14.5Cu0.5Ca2Cx
Authors: Sun Zhi-Gang  , Zhang Shao-Ying  , Zhang Hong-Wei  , Han Bao-Shan  , Shen Bao-Gen  ,   中国科学院物理研究所与凝聚态物理中心磁学国家重点实验室，北京 100080
Published: December 2020

The microstructure and magnetic domain structures of the annealed quick-quenched ribbon Sm2Fe14.5Cu0.5Ca2Cx were studied by using magnetic force microscope. The results of the topography image and magnetic force image (MFI) show that the grain size is between 2555nm, whereas the domain size is between 200400nm. The magnetic domain length scale is much larger than the grain size. The domain comprises of a lot of grains, which were called interaction domain. The detail analysis such as power spectral density analysis, the maximum phase shift and roughness analyses on the MFI demonstrated that they are connected with the intrinsic magnetic properties such as HA in some way.
Effect of Different Wheel Speed on Magnetic Properties of Nd8Fe85Mo1B6
Authors: Yin Jin-Hua  , Ji Qi-Gen  , Jin Zhi-Qiang  , Tang Shao-Long  , Zhang Jian-Rong  , Du You-Wei  ,   南京大学物理系，南京 210093
Published: December 2020

The melt-spun ribbons of Nd8Fe85Mo1B6 have been prepared by directly rapid quenching at different wheel speeds. From the result of vibrating sample magnetometer measurement, we found that the magnetic properties of the ribbons are dependent on the wheel speed. X-ray diffraction and thermomagnetic analysis were also used to investigate microstructure and phase composition of the samples. The result shows that the TbCu7 phase increases with increasing wheel speed; at the same time, a decreased grain size of the α-Fe phase is observed. The change of magnetic properties is due to the change of phase composition and grain size of the samples.
CHAOTIC BEHAVIORS IN A SELF-MODE-LOCKED TI：SAPPHIRE RING LASER
Authors: CHAI LU  , XING QI-RONG  , ZHANG WEI-LI  , WANG QING-YUE  ,   (1)天津大学精密仪器与光电子工程学院超快激光研究室；国家教育部光电子信息技术科学开放实验室，天津  300072; (2)天津大学理学院应用物理系，天津  300072
Published: December 2020

Chaotic behaviors in a self-mode-locked Ti:sapphier ring laser are reported.The Regular,peri-od-doubling,quasi-periodic and chaotic behaviors are observed under some control conditions.The ex-perimental observations are in agreement with the theoretical predictions by V.L.Kalashnikov et al.
M2-FACTOR AND COHERENT-MODE DECOMPOSITION OF SINH-GAUSSIAN BEAMS
Authors: ZHANG BIN  , MA HONG  , LV BAI-DA  ,   四川大学激光物理与化学研究所，成都  610064
Published: December 2020

Based on the second moments method and orthogonal basis mode expansion,analytical expre-sions for the M2-factor and mode coherence coefficients of sinh-Gaussian beams have been derived,thus the coherent-mode decompositions of sinh-Gaussian beams have been made.A simple method has also been proposed to produce sinh-Gaussian beams in the laboratory.
Magnetic Properties and Giant Magnetoimpednce Effects of FeCuNdSiB Single Layered and Sandwiched Films
Authors: Xiao Shu-Qin  , Liu Yi-Hua  , Yan Shi-Shen  , Dai You-Yong  , Zhang Lin  , Mei Liang-Mo  ,   山东大学物理系，济南 250100
Published: December 2020

Magnetic properties and giant magneto-impedance (GMI) effects of Fe73.5Cu1Nb3Si13.5B9 single layered films and sandwiched fimls using Cu or Ag as the central layer prepared by radio frequency sputtering are investigated. The as-deposited single layered films are in amorphous state. The domain structures of single layered films annealed as 380℃ show that the films are in nanocrystalline state with homogeneous magnetization. The samples possess excellent soft magnetic properties and have the maxiumum values of GMI effects, the maxiumum GMI ratios are 18% and 14% in longitudinal and transverse fields, respectively, at 13MHz. Sandwiched films in the as-deposited state possess large GMI effects, the maximum GMI ratios of sandwiched films with a Cu central layer are 32% and 11% for longitudinal and transverse cases, respectively, and those of sandwiched films with a Ag central layer are 47% and 57% for longitudinal and transverse cases, respectively. Sandwiched films using Cu as the inner layer annealed at 250℃ exhibit large magneto-inductance effect at low frequencies. The maximum magneto-inductance ratio is 1733% at 100kHz.