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Exact Solution of a Backward Scattering Kondo Model

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Chinese Physics Letters 1996年第9期13卷 703-706页

作者： WANG Yu-peng pu fu-ke Cryogenic Laboratory Chinese Academy of SciencesBeijing 100080 Department of Physics Guangzhou Teachers’CollegeGuangzhou 510400 Institute of Physics Chinese Academy of SciencesBeijing 100080

To specify the difference between the one-dimensional Kondo problem and the three-dimensional Kondo problem,we consider a model which describes the interaction between one-dimensional free electrons and a magnetic *** ansatz exact results and scaling analysis show that if J_(F)>-|J_(B)|,the Kondo screening *** is no ferromagnetic Kondo screening in such a system but the long range antiferromagnetic Kondo coupling is *** soon as the Coulomb interaction is introduced,the crossovers between the scaling trajectories in the parameter region J_(F)<-|J_(B)|and the trajectories in other parameter regions arise and ferromagnetic Kondo screening may occur.

关键词： Kondo ferromagnetic scaling

Exactly Solved Anderson Lattice Model

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Chinese Physics Letters 1996年第3期13卷 207-210页

作者： LIU Wu-ming ZHAO Hong-wei pu fu-ke Institute of Physics Chinese Academy of SciencesBeijing 100080 Institute of Theoretical Physics Shanxi UniversityTaiyuan 030006 International Center for Materials Physics Chinese Academy of SciencesShenyang 110015 Department of Physics Tsinghua UniversityBeijing 100084 CCAST(World Laboratory) PO.Box 8730Beijing 100080

A solvable Anderson lattice model is *** exact eigenstates of model Hamiltonian are constructed by using the Bethe *** Be the ansatz equations are obtained from the periodic boundary conditions.

关键词： conditions Hamiltonian exact

Temperature Effect on Giant Magnetoresistance in Magnetic Multilayers

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Chinese Physics Letters 1996年第1期13卷 50-53页

作者： ZHANG Ling-yun YANG Guo-lin LI Bo-zang pu fu-ke Institute of Physics AcademiaSinicaBeijing 100080

We have presented the electronic free energy with respect to the magnetization and the model of the electronic density of *** expression of the giant magnetore-sist^nce has been obtained by considering the spin splitting of the electronic energy *** approach explained the temperature effect on the giant magnetoresistancG in magnetic multilayers.

关键词： resistance electronic magnetization

An Integrable Bose Fermion Model

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Chinese Physics Letters 1999年第11期16卷 787-789页

作者： YANG Fan WANG Yu-peng CHEN Shu pu fu-ke Institute of Physics and Center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080 Cryogenic Laboratory Chinese Academy of SciencesBeijing 100080 Theoretishe Physik II Universität Augsburg 86135AugsburgGermany Department of Physics Guangzhou Normal CollegeGuangzhou 510400

In this paper, we derive the higher order Hamiltonian of the three-wave interaction fermion model II by the Neumann expansion and find it physically interesting as related to the pairing process of the high Tc super-c... 详细信息

关键词： method Fermi inverse

Angular Dependence of the Interlayer Exchange Coupling on the Nonmagnetic Cap Layers

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Chinese Physics Letters 1997年第10期14卷 789-792页

作者： ZHANG Xiang-dong LI Lie-ming ZHAN Ye-hong LI Bo-zang pu fu-ke Institute of Physics&Center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080 2Department of Physics Tsinghua UniversityBeijing 100084 3Department of Physics Guangzhou Industry UniversityGuangzhou 510090 4Department of Physics Guangzhou Normal CollegeGuangzhou 510400

Based on the one-band tight-binding model,the angular dependence of interlayer exchange coupling was investigated on the nonmagnetic cap layers in a magnetic sandwich covered on both sides by nonmagnetic *** results show that(1)the appearance of noncollinear exchange coupling is very sensitive to the cap layers,(2)the nonoscillatory component of the coupling strength varies generally with the thickness of outer nonmagnetic films,and(3)the variation of exchange coupling exhibits distinct features in the cases where the thicknesses of both outer nonmagnetic films vary simultaneously and where the thickness of one of the two outer nonmagnetic films is fixed while the other is varied.

关键词： coupling outer magnetic

Integrable Multi-impurity Open XXZ Chain with Next-Nearest-Neighbor Interaction

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Chinese Physics Letters 1999年第6期16卷 434-436页

作者： LAI Yun-zhong ZHANG Ai-zhen HU Zhan-ning LIANG Jiu-qing pu fu-ke Institute of Physics and Center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080 Institute of Theoretical Physics Shanxi UniversityTaiyuan 030006 Department of Applied Science Taiyuan Heavy Machinery InstituteTaiyuan 030024 Department of Physics Guangzhou Normal CollegeGuangzhou 510400

The Hamiltonian of one-dimensional integrable multi-impurity XXZ spin chain with open boundary cases is constructed by using the method of adding parameters to the vertical *** is the first approach to add multi-impurity and next-nearest-neighbor interaction to the integrable anisotropic Heisenberg spin *** is found that all of the impurity parameters in the bulk must be pure imaginary numbers if the cross parameter is real for getting the hermitian Hamiltonian,or vice versa,when the next-nearest-neighbor interactions are *** Hamiltonian can be also applied to describe the many body systems with two kinds of particles if all of the impurity parameters are equal.

关键词： integrable Hamiltonian neighbor

Periodic Instanton Calculations of Quantum-Classical Transitions in Spin Systems

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Chinese Physics Letters 1998年第9期15卷 683-685页

作者： ZHANG Yun-bo NIE Yi-hang KOU Su-peng WANG Xiao-bing LIANG Jiu-qing pu fu-ke Institute of Physics and Center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080 Department of Physics Shanxi UniversityTaiyuan 030006 Center for Advanced Study Tsinghua UniversityBeijing 100084 Department of Physics Guangzhou Normal CollegeGuangzhou 510400

The quantum-classical transitions of the escape rates in the molecular magnet Mnl2Ac and a biaxial anisotropic ferromagnetic spin model are investigated by applying the periodic instanton *** effective free energies are expanded around the top of the potential barrier in analogy to the Landau theory of phase *** show that the first-order transitions occur below the critical external magnetic field h_(x)=1/4 for Mnl2Ac and beyond the critical anisotropy constant ratioλ=1/2 for the biaxial ferromagnetic grains,which is in good agreement with earlier studies.

关键词： transitions ferromagnetic Transition