Ferromagnetic quantum critical fluctuations in YbRh2(Si0.95Ge0.05)2 -: art. no. 076402

被引：121

作者：

Gegenwart, P ^{[1
]}

Custers, J

Tokiwa, Y

Geibel, C

Steglich, F

机构：

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

[2] Univ St Andrews, Sch Phys & Astron, St Andrews KY16 9SS, Fife, Scotland

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.94.076402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The bulk magnetic susceptibility chi(T,B) of YbRh2 (Si0.95Ge0.05)(2) has been investigated close to the field-induced quantum critical point at B-c = 0.027 T. For B less than or equal to 0.05 T a Curie-Weiss law with a negative Weiss temperature is observed at temperatures below 0.3 K. Outside this region, the susceptibility indicates ferromagnetic quantum critical fluctuations, chi(T) proportional to T-0.6 above 0.3 K. At low temperatures the Pauli susceptibility follows chi(0) proportional to(B - B-c)(-0.6) and scales with the coefficient of the T-2 term in the electrical resistivity. The Sommerfeld-Wilson ratio is highly enhanced and increases up to 30 close to the critical field.

引用

页数：4

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