Unconventional metallic state in YbRh2Si2 -: a high-pressure study

被引：10

作者：

Mederle, S ^{[1
]}

Borth, R ^{[1
]}

Geibel, C ^{[1
]}

Grosche, FM ^{[1
]}

Sparn, G ^{[1
]}

Trovarelli, O ^{[1
]}

Steglich, F ^{[1
]}

机构：

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

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2001年 / 226卷

关键词：

non-Fermi liquid; resistivity; specific heat; pressure effect;

D O I：

10.1016/S0304-8853(00)00652-1

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

YbRh2Si2 is identified to be one of the few stoichiometric and the first Yb-based heavy fermion compound showing non-Fermi-liquid (NFL) effects at ambient pressure. We present results of a detailed study of the electrical resistivity rho (T) and the specific heat C(T) under hydrostatic pressure and map out the magnetic phase diagram up to about 2.5 GPa. While at p < 1.5 GPa only one anomaly is observed in rho (T), two subsequent anomalies are found at p > 1.5 GPa. These anomalies are interpreted as signature of (presumably antiferro) magnetic phase transitions. The results of our specific heat measurements prove that those phase transitions are a true bulk effect. In addition. NFL-behavior is found to exist over a broad range of temperature and pressure for temperatures above the magnetic instability. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：254 / 255

页数：2

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