Field-induced magnetic ordering in NiCl2•4SC(NH2)2 -: art. no. 020405

被引:85
|
作者
Paduan, A [1 ]
Gratens, X [1 ]
Oliveira, NF [1 ]
机构
[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil
关键词
D O I
10.1103/PhysRevB.69.020405
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have investigated the low-temperature T field-induced ordering in NiCl2.4SC(NH2)(2), from magnetization measurements. This is an S=1 system with a large single-ion uniaxial anisotropy leaving a singlet ground state. An external magnetic field (B) parallel to the symmetry axis induces an antiferromagnetically ordered phase for B-c1<B<B-c2. The establishment of this long-range order can be regarded as a Bose-Einstein condensation of magnons. The phase boundaries are predicted to obey power laws [B-c(T)-B-c(0)]proportional toT(alpha). The determined phase boundaries could be fitted to power laws yielding alpha(1)=2.63+/-0.10 for B-c1(T) and alpha(2)=2.55+/-0.10 for B-c2(T).
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页数:4
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