Preformed heavy electrons: A possible origin of characteristic energy scale in YbRh 2Si 2

Physical Review B - Condensed Matter and Materials Physics

Volumn 85, Issue 16, 2012, Pages

  Tran, Minh Tien ^a,b   Benlagra, A ^c   Pepin C ^d   Kim, Ki Seok ^a,e  

^a Asia Pacific Center for Theoretical Physics (APCTP)   (South Korea)

^b INSTITUTE OF PHYSICS   (Viet Nam)

^c DRESDEN UNIVERSITY OF TECHNOLOGY   (Germany)

^d DIF   (France)

^e Pohang University of Science and Technology (POSTECH)   (South Korea)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 84860300516     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.85.165118     Document Type: Article

References (48)

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48. The CTMA based on the U(1) slave-boson representation describes static properties of the Kondo problem quite well even in a quantitative level, particularly, thermodynamics such as specific heat and spin susceptibility. This accuracy for thermodynamics originates from the fact that the coefficients for the spectral functions of pseudoparticles in CTMA coincide with those in exact results based on Bethe ansatz and conformal field theory (of slave particles). An essential point in the CTMA framework is that all artificially generated singularities, which result from limits of various approximations, are canceled consistently, which implies that main singular quantum corrections are taken appropriately. However, a difficulty arises when one tries to evaluate the impurity spectral function, where the sum rule is overestimated in the unitary limit. See S. Kirchner, J. Kroha, and P. Wolfle, Phys. Rev. B PRBMDO 1098-0121 10.1103/PhysRevB.70.165102 70, 165102 (2004). The violation of the sum rule in the unitary limit originates from an incorrect value of the renormalized impurity chemical potential. In spite of such a problem in the CTMA impurity spectral function, we expect that the existence of the intermediate non-Fermi liquid crossover regime can be identified rather reliably in the CTMA framework because such a phase is determined from thermodynamics, quantitatively well described by CTMA.