Crossover between Fermi Liquid and Non-Fermi Liquid in Orbitally Degenerate Kondo Systems
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概要
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Entanglertaent of spin ar?d orbital Kondo effect is investigated on the basis of a Kondo-typeexchange nuodel xvith txvofold orbital degeneracy. By vrsing Wilson's ntrnaerical renornaalization-group raaethod, xve exaraaine dynarnical and tluerrmal properties respecting the diflererace in time-reversal property of rntrltipole operators. In the presence of' particle-hole syrn?netry, tlae modelhas a new non-Feruni-liqtrid fixed poitat with a fractional entropy. Tlue spectral intensity of tlaeqtradrttpole susceptibility diverges in the zero-f'requency litaait, xvhile tlae dipole strsceptibilityshoxvs a Fer?ni-liqtrid-like bel'uavior. This is understood by mapping to tlae txvo-channel Kondonuodel, in xvl'nich tlte dipole taaouauent is trapped or'xto tlae operators xvith tl?e scaling dinaensionA,.. : l, while the quadrtrpole unoment onto tlae operators with another scalir?g dimension.A. = 172. Even for a fairly particle-hole asynatnetric case with the Fermi-liqtrid ground state,the non-Ferrni-Iiqtrid belaavior laas significant infltrences ita electric and therrnal properties.
- 社団法人日本物理学会の論文
- 1999-12-15
著者
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Kuramoto Yoshio
Department Of Applied Physics Tohoku University
-
Kusunose Hiroaki
Department Of Material Physics Faculty Of Engineering Science Osaka University
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Kuramoto Yoshio
Department Of Applied Physics Faculty Of Engineering Tohoku University
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