Experimental evidence for competition between antiferromagnetic and ferromagnetic correlations in HgCr2S4

被引：39
|
作者：
Tsurkan, V [1 ]
Hemberger, J
Krimmel, A
von Nidda, HAK
Lunkenheimer, P
Weber, S
Zestrea, V
Loidl, A
机构：
[1] Univ Augsburg, Ctr Elect Correlat & Magnetism, D-86159 Augsburg, Germany
[2] Moldavian Acad Sci, Inst Appl Phys, Kishinev, Moldova
来源：
PHYSICAL REVIEW B | 2006年 / 73卷 / 22期
关键词：
D O I：
10.1103/PhysRevB.73.224442
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A detailed study of polycrystalline and single crystalline samples of the normal spinel HgCr2S4 is reported. The structural refinement reveals enhanced values of the atomic displacements suggesting the closeness to a structural instability. Magnetization, electron-spin resonance, and specific-heat studies document strong ferromagnetic fluctuations close to 50 K and the occurrence of complex antiferromagnetic order at T-N=22 K. We found highly unconventional behavior resembling properties of a noncollinear antiferromagnet and of a soft ferromagnet dependent on temperature and magnetic field. Even weak external magnetic fields disturb the antiferromagnetic order and strongly enhance the ferromagnetic correlations. The observed anomalies are related to bond frustration due to competing magnetic exchange interactions between the Cr ions.
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页数：8
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