Anisotropy of the magnetic susceptibility of CeCu6-xAux near the quantum phase transition

被引：3
|
作者：
Tomanic, T. [1 ]
Hamann, A. [1 ]
Loehneysen, H. V. [1 ,2 ]
机构：
[1] Univ Karlsruhe, Inst Phys, TH, D-76128 Karlsruhe, Germany
[2] Forschungszentrum Karlsruhe, Inst Festkorperphys, D-76021 Karlsruhe, Germany
来源：
PHYSICA B-CONDENSED MATTER | 2008年 / 403卷 / 5-9期
关键词：
quantum phase transition; heavy-fermion systems; magnetic susceptibility;
D O I：
10.1016/j.physb.2007.10.137
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We report on the low-temperature dc magnetic susceptibility of CeCu6-xAux (x = 0.1) in very small fields B = 100 mu T and 1 mT. For x= 0.1, i.e. for the quantum critical concentration, we confirm the anomalous exponent alpha of the susceptibility along the easy c-direction, chi(-1)(c)similar to theta+T-alpha with alpha = 0.8 observed previously in moderate fields B = 100mT (see, A. Schroder, et al., Nature 407 (2000) 351). However, below 240mK we see a clear additional contribution to chi(c). At the lowest measuring temperature T = 40mK, the ratio chi(c): chi(a): chi(b) = 4:1.5: 1 of the susceptibility anisotropy is weaker than at higher T where the ratio is 10:2: 1. This is caused by a steeper increase of chi(a) and chi(b) as compared to chi(c). (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：1323 / 1324
页数：2
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