Bose-Einstein condensation of magnons in Cs2CuCl4 -: art. no. 127202

被引：142

作者：

Radu, T

Wilhelm, H

Yushankhai, V

Kovrizhin, D

Coldea, R

Tylczynski, Z

Lühmann, T

Steglich, F

机构：

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

[2] Joint Inst Nucl Res, Theoret Phys Lab, Dubna 141980, Russia

[3] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[4] Univ Oxford, Clarendon Lab, Oxford OX1 3PU, England

[5] Adam Mickiewicz Univ Poznan, Inst Phys, PL-61614 Poznan, Poland

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.95.127202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on results of specific heat measurements on single crystals of the frustrated quasi-2D spin-1/2 antiferromagnet Cs2CuCl4 (T-N=0.595 K) in external magnetic fields B < 12 T and for temperatures T > 30 mK. Decreasing B from high fields leads to the closure of the field-induced gap in the magnon spectrum at a critical field B-c similar or equal to 8.51 T and a magnetic phase transition is clearly seen below B-c. In the vicinity of B-c, the phase transition boundary is well described by the power law T-c(B)proportional to(B-c-B)(1/phi), with the measured critical exponent phi similar or equal to 1.5. These findings are interpreted as a Bose-Einstein condensation of magnons.

引用

页数：4

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