Anomalous local fermi liquid in f2-singlet configuration: Impurity model for heavy-electron system UPt3

Satoshi Yotsuhashi, Kazumasa Miyake, Hiroaki Kusunose

5 被引用数 (Scopus)

抄録

It is shown by the Wilson numerical renormalization group method that a strongly correlated impurity with a crystalline-electric-field singlet ground state in the f2-configuration exhibits an anomalous local Fermi liquid state in which the static magnetic susceptibility remains an uncorrelated value while the NMR relaxation rate is enhanced in proportion to the square of the mass enhancement factor. Namely, the Korringa-Shiba relation is apparently broken. This feature closely matches the anomalous behaviors observed in UPt3, i.e., the coexistence of an unenhanced value of the Knight shift due to quasiparticles contribution (the decrease across the superconducting transition) and the enhanced relaxation rate of NMR. Such an anomalous Fermi liquid behavior suggests that the Fermi liquid corrections for the susceptibility are highly anisotropic.

本文言語 English 034719 Journal of the Physical Society of Japan 85 3 https://doi.org/10.7566/JPSJ.85.034719 Published - 15 3 2016