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Seuring, Carolin; Scheidt, Ernst‐Wilhelm; Bauer, E.; Stewart, G. R.

doi:10.1023/a:1017589213930

Cited by 7 publications

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“…Antiferromagnetism is found in YbCu 5Ϫx Al x for x ϭ1.6-2.0. At x crit ϭ1.5, C/T is ϳϪlog T between 0.2 and 1.2 K, but clearly follows the temperature dependence of the self-consistent renormalization theory over the whole temperature range of measurement, 0.1-3 K (Seuring et al, 2001). The resultant y 0 fit parameter (which should be zero at a quantum critical point) is 0.05, indicating that the xϭ1.5 sample is not exactly the optimal concentration.…”

Section: Ce 1ϫx La X Ru 2 Simentioning

confidence: 81%

Addendum: Non-Fermi-liquid behavior ind- andf-electron metals

2006

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A relatively new class of materials has been found in which the basic assumption of Landau Fermi-liquid theory-that at low energies the electrons in a metal should behave essentially as a collection of weakly interacting particles-is violated. These ''non-Fermi-liquid'' systems exhibit unusual temperature dependences in their low-temperature properties, including several examples in which the specific heat divided by temperature shows a singular log T temperature dependence over more than two orders of magnitude, from the lowest measured temperatures in the milliKelvin regime to temperatures over 10 K. These anomalous properties, with their often pure power-law or logarithmic temperature dependences over broad temperature ranges and inherent low characteristic energies, have attracted active theoretical interest from the first experimental report in 1991. This article first describes the various theoretical approaches to trying to understand the source of strong temperature-and frequency-dependent electron-electron interactions in non-Fermi-liquid systems. It then discusses the current experimental body of knowledge, including a compilation of data on non-Fermi-liquid behavior in over 50 systems. The disparate data reveal some interesting correlations and trends and serve to point up a number of areas where further theoretical and experimental work is needed. CONTENTS I. Introduction 798 II. Theory 799 A. The single-impurity multichannel Kondo model and non-Fermi liquids 799 B. Quantum critical point theories 800 1. Scaling analysis at a quantum critical point 801 2. Spin-fluctuation theory of non-Fermi-liquid behavior 802 a. Millis and Hertz 802 b. Self-consistent renormalization model 802 3. Local deviation from Fermi-liquid behavior 804 C. Disorder-induced non-Fermi-liquid behavior theories 804 III. Experiment 806 A. Doped systems 807 1. Antiferromagnetism ''distant'' in the phase diagram 807 a. U x Y 1Ϫx Pd 3 (I) 808 b. UCu 5Ϫx Pd x (I) 820 c. UCu 5Ϫx Pt x (II) 822 d. UCu 4 Ni (II) 823 e. UCu 5Ϫx Al x (III) 823 f. Ce 1Ϫx La x Cu 2 Si 2 (I) 824 g. (U x La 1Ϫx) 2 Zn 17 (I) 824 h. U 2 Cu 17Ϫx Al x (I) 825 i. U 1Ϫx Y x Al 2 (I) 825 j. U x Th 1Ϫx Ru 2 Si 2 , xр0.07 (I) 826 k. U x Y 1Ϫx Ru 2 Si 2 , xр0.07 (III) 826 l. U x Th 1Ϫx Pt 2 Si 2 , xр0.07 (III) 826 m. U x Th 1Ϫx Pd 2 Si 2 (I?) 826 n. U 1Ϫx M x Pt 3 (I) 827 o. Ce 1Ϫx Th x RhSb (I?) 827 p. URu 2Ϫx Re x Si 2 (III) 827 q. U 2 Pd 1Ϫx Si 3ϩx (II) 828 r. Ce 0.1 La 0.9 Pd 2 Al 3 (III) 828 s. U 0.1 M 0.9 In 3 , MϭY,Pr,La (I) 828 t. CePt 0.96 Si 1.04 (I?) 828

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