Magnetic field-induced phase transition of quantum spin system Cu2Cl4•H8C4SO2

被引：0
|
作者：
Fujisawa, Masashi [1 ]
Tanaka, Hidekazu [2 ]
Sakakibara, Toshiro [3 ]
机构：
[1] Tokyo Inst Technol, Dept Phys, Tokyo 1528551, Japan
[2] Tokyo Inst Technol, Res Ctr Low Temp Phys, Tokyo 1528551, Japan
[3] Univ Tokyo, Inst Solid State Phys, Tokyo 1138654, Japan
来源：
LOW TEMPERATURE PHYSICS, PTS A AND B | 2006年 / 850卷
关键词：
quasi one dimension; magnon BEC; spin gap;
D O I：
暂无
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
The magnetic properties of Cu2Cl4.H8C4S02 are described by an S = 1/2 double spin chain with strong exchange interactions along the leg direction. This system has a singlet ground state with an excitation gap of Delta/k(B) = 5.13 K. We have measured the magnetization and the specific heat of Cu2Cl4.H8C4SO2. The magnetic phase transition due to interchain interactions was observed for H > 4 T. Magnetic phase diagrams were obtained for H vertical bar vertical bar b- and c-axes. The phase boundaries for these two different field directions can be represented by the power law (g/2) [H-N (T)-H-g] proportional to T-phi with (g/2)H-g = 3.83 T and phi = 1.98. The experimental exponent phi = 1.98 is somewhat larger than the value phi(BEC) = 3/2 predicted by the magnon Bose-Einstein condensation theory.
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页码：1039 / +
页数：2
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