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题名: Universality class of non-Fermi-liquid behavior in mixed-valence systems
作者: Zhang, GM ;  Su, ZB ;  Yu, L
刊名: PHYSICAL REVIEW B
出版日期: 1996
卷号: 53, 期号:2, 页码:715-725
关键词: EXTENDED HUBBARD-MODEL ;  KONDO PROBLEM ;  RENORMALIZATION-GROUP ;  INFINITE DIMENSIONS ;  ANDERSON MODEL ;  METALS ;  PHASES
学科分类: Physics
通讯作者: Zhang, GM , INT CTR THEORET PHYS,POB 586,I-34100 TRIESTE,ITALY.
部门归属: UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT MATH,LONDON SW7 2BZ,ENGLAND; ACAD SINICA,INST THEORET PHYS,BEIJING 100080,PEOPLES R CHINA
英文摘要: A generalized Anderson single-impurity model with off-site Coulomb interactions is derived from the extended three-band Hubbard model, originally proposed to describe the physics of the copper oxides. Using the Abelian bosonization technique and canonical transformations, an effective Hamiltonian is derived in the strong-coupling limit, which is essentially analogous to the Toulouse limit of the ordinary Kondo problem. In this limit, the effective Hamiltonian can be exactly solved, with a mixed-valence quantum critical point separating two different Fermi-liquid phases, i.e., the Kondo phase and the empty orbital phase. In the mixed-valence quantum critical regime, the local moment is only partially quenched and x-ray edge singularities are generated. Around the quantum critical point, a type of non-Fermi-liquid behavior is predicted with an extra specific heat C-imp similar to T-1/4 and a singular spin susceptibility chi(imp)similar to T-3/4. At the same time, the effective Hamiltonian under single occupancy is transformed into a resonant-level model, from which the correct Kondo physical properties (specific heat, spin susceptibility, and an enhanced Wilson ratio) are easily rederived. Finally, a brief discussion is given to relate these theoretical results to observations in UPdxCu5-x (x=1,1.5) alloys, which show single-impurity critical behavior consistent with our predictions.
收录类别: SCI
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/12675
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Recommended Citation:
Zhang, GM,Su, ZB,Yu, L. Universality class of non-Fermi-liquid behavior in mixed-valence systems[J]. PHYSICAL REVIEW B,1996,53(2):715-725.
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