Logarithmic fermi-liquid breakdown in NbFe2

被引：77

作者：

Brando, M.

Duncan, W. J. ^{[2
]}

Moroni-Klementowicz, D. ^{[2
]}

Albrecht, C. ^{[2
]}

Gruener, D. ^{[1
]}

Ballou, R. ^{[3
,4
]}

Grosche, F. M. ^{[2
]}

机构：

[1] Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany

[2] Univ London, Dept Phys, Egham TW20 0EX, Surrey, England

[3] CNRS, Inst Neel, F-38042 Grenoble 9, France

[4] Univ Grenoble 1, F-38042 Grenoble 9, France

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 02期

基金：

英国工程与自然科学研究理事会;

关键词：

D O I：

10.1103/PhysRevLett.101.026401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The d-electron low temperature magnet NbFe(2) is poised near the threshold of magnetism at ambient pressure, and can be tuned across the associated quantum critical point by adjusting the precise stoichiometry within the Nb(1-y)Fe(2+y) homogeneity range. In a nearly critical single crystal (y=-0.01), we observe a T(3/2) power-law dependence of the resistivity rho on temperature T and a logarithmic temperature dependence of the Sommerfeld coefficient gamma=C/T of the specific heat capacity C over nearly 2 orders of magnitude in temperature, extending down to 0.1 K.

引用

页数：4

共 20 条

[1]

Baym G., 1991, Landau Fermi Liquid Theory

[2] Nonanalytic behavior of the spin susceptibility in clean Fermi systems [J].