Anomalous Local Fermi Liquid in f(2)-Singlet Configuration: Impurity Model for Heavy-Electron System UPt3

作者:Yotsuhashi Satoshi*; Miyake Kazumasa; Kusunose Hiroaki
来源:Journal of the Physical Society of Japan, 2016, 85(3): 034719.
DOI:10.7566/JPSJ.85.034719

摘要

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 f(2)-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.

  • 出版日期2016-3-15