Experimental Realization of a Spin-1/2 Triangular-Lattice Heisenberg Antiferromagnet

被引：244
|
作者：
Shirata, Yutaka [1 ]
Tanaka, Hidekazu [1 ]
Matsuo, Akira [2 ]
Kindo, Koichi [2 ]
机构：
[1] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan
[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 05期
基金：
日本学术振兴会;
关键词：
HIGH-FIELD MAGNETIZATION; PHASE-TRANSITIONS; CSNICL3; SPECTRA; CSCOCL3; STATES; ORDER; MN; NI; CO;
D O I：
10.1103/PhysRevLett.108.057205
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report the results of magnetization and specific heat measurements on Ba3CoSb2O9, in which the magnetic Co2+ ion has a fictitious spin 1/2, and provide evidence that a spin-1/2 Heisenberg anti-ferromagnet on a regular triangular lattice is actually realized in Ba3CoSb2O9. We found that the entire magnetization curve including the one-third quantum magnetization plateau is in excellent quantitative agreement with the results of theoretical calculations. We also found that Ba3CoSb2O9 undergoes a three-step transition within a narrow temperature range.
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页数：5
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