μSR and NMR in f-electron non-Fermi liquid materials

被引：10

作者：

MacLaughlin, DE ^{[1
]}

Rose, MS

Young, BL

Bernal, OO

Heffner, RH

Morris, GD

Ishida, K

Nieuwenhuys, GJ

Sonier, JE

机构：

[1] Univ Calif Riverside, Dept Phys, Riverside, CA 92521 USA

[2] Calif State Univ Los Angeles, Dept Phys & Astron, Los Angeles, CA 90032 USA

[3] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[4] Osaka Univ, Grad Sch Engn Sci, Dept Phys Sci, Toyonaka, Osaka 5608531, Japan

[5] Leiden Univ, Kamerlingh Onnes Lab, NL-2300 RA Leiden, Netherlands

[6] Simon Fraser Univ, Dept Phys, Burnaby, BC V5A 1S6, Canada

来源：

PHYSICA B-CONDENSED MATTER | 2003年 / 326卷 / 1-4期

基金：

美国国家科学基金会;

关键词：

non-Fermi liquids; disorder-driven mechanisms; quantum critical points; CePtSi1-xGex;

D O I：

10.1016/S0921-4526(02)01637-X

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Magnetic resonance (muSR and NMR) studies of f-electron non-Fermi-liquid (NFL) materials give clear evidence that structural disorder is a major factor in NFL behavior. Longitudinal-field muSR relaxation measurements at low fields reveal a wide distribution of muon relaxation rates and divergences in the frequency dependence of spin correlation functions in the NFL systems UCu5-xPdx and CePtSi1-xGex. These divergences seem to be due to slow dynamics associated with quantum spin-glass behavior, rather than quantum criticality as in a uniform system, for two reasons: the observed strong inhomogeneity in the muon relaxation rate, and the strong and frequency-dependent low-frequency fluctuation observed in U(Cu,Pd)(5) and CePt(Si,Ge). In the NFL materials CeCu5.9Au0.1, Ce(Ru0.5Rh0.5)(2)Si-2, CeNi2Ge2, and YbRh2Si2 the low-frequency weight of the spin fluctuation spectrum is much weaker than in the disordered NFL systems. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：381 / 386

页数：6

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