CsMn(BrxI1-x)3:: Crossover from an XY to an Ising chiral antiferromagnet

被引：1
作者：
Bügel, R
Wosnitza, J
von Löhneysen, H
Ono, T
Tanaka, H
机构：
[1] Univ Karlsruhe, Inst Phys, Kaiserstr 12, D-76128 Karlsruhe, Germany
[2] Tokyo Inst Technol, Dept Phys, Tokyo 152, Japan
来源：
PHYSICAL REVIEW B | 2001年 / 64卷 / 09期
关键词：
D O I：
10.1103/PhysRevB.64.094406
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We report on high-resolution specific-heat and magnetocaloric-effect measurements of the triangular-lattice antiferromagnets CsMn(BrxI1-x)(3) with different x. The evolution of the magnetic phase diagrams from the easy-axis system for x = 0 to the easy-plane system for x = 1 was studied in detail. The specific-heat critical exponent alpha of the almost isotropic x=0.19 system agrees with the value predicted for a chiral Heisenberg scenario. In an applied magnetic field (B = 6 T) a crossover to a weak first-order transition is detected.
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