Universality class of non-Fermi-liquid behavior in mixed-valence systems

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	Universality class of non-Fermi-liquid behavior in mixed-valence systems
	Yu, L; Zhang, GM; Su, ZB; Zhang, GM , INT CTR THEORET PHYS,POB 586,I-34100 TRIESTE,ITALY.
刊名	PHYSICAL REVIEW B
	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
ISSN号	0163-1829
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.
学科主题	Physics
URL标识	查看原文
公开日期	2012-08-29
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/12675]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Zhang, GM , INT CTR THEORET PHYS,POB 586,I-34100 TRIESTE,ITALY.
推荐引用方式 GB/T 7714	Yu, L,Zhang, GM,Su, ZB,et al. Universality class of non-Fermi-liquid behavior in mixed-valence systems[J]. PHYSICAL REVIEW B,1996,53(2):715-725.
APA	Yu, L,Zhang, GM,Su, ZB,&Zhang, GM , INT CTR THEORET PHYS,POB 586,I-34100 TRIESTE,ITALY..(1996).Universality class of non-Fermi-liquid behavior in mixed-valence systems.PHYSICAL REVIEW B,53(2),715-725.
MLA	Yu, L,et al."Universality class of non-Fermi-liquid behavior in mixed-valence systems".PHYSICAL REVIEW B 53.2(1996):715-725.