Quantum phase diagram of the S=1/2 triangular-lattice antiferromagnet Ba3CoSb2O9

被引：75
作者：
Koutroulakis, G. [1 ,2 ]
Zhou, T. [2 ]
Kamiya, Y. [3 ,4 ,5 ,6 ]
Thompson, J. D. [1 ]
Zhou, H. D. [7 ]
Batista, C. D. [5 ,6 ]
Brown, S. E. [2 ]
机构：
[1] Los Alamos Natl Lab, MPA CMMS, Los Alamos, NM 87545 USA
[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA
[3] RIKEN, iTHES Res Grp, Wako, Saitama 3510198, Japan
[4] RIKEN, Condensed Matter Theory Lab, Wako, Saitama 3510198, Japan
[5] Los Alamos Natl Lab, Div Theoret, T4, Los Alamos, NM 87545 USA
[6] Los Alamos Natl Lab, CNLS, Los Alamos, NM 87545 USA
[7] Univ Tennessee, Dept Phys & Astron, Knoxville, TN 37996 USA
来源：
PHYSICAL REVIEW B | 2015年 / 91卷 / 02期
基金：
美国国家科学基金会;
关键词：
MAGNETIC-FIELD; HEISENBERG-ANTIFERROMAGNET; MODEL; CONDENSATION;
D O I：
10.1103/PhysRevB.91.024410
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The magnetic phases of the ideal spin-1/2 triangular-lattice antiferromagnet Ba3CoSb2O9 are identified and studied using Ba-135,Ba-137 nuclear magnetic resonance (NMR) spectroscopy in magnetic fields ranging to 30 T, oriented parallel and near perpendicular to the crystallographic ab plane. For both directions, the saturation field is approximately 33 T. Notably, the NMR spectra provide microscopic evidence for the stabilization of an up-up-down spin configuration for in-plane fields, giving rise to a 1/3 magnetization plateau (M-sat/3), as well as for a higher-field phase transition near to similar to(3/5)M-sat for both field orientations. Phase transitions are signaled by the evolution of the NMR spectra, and in some cases through spin-lattice relaxation measurements. The results are compared with expectations obtained from a semiclassical energy density modeling, in which quantum effects are incorporated by effective interactions extracted from the spin-wave analysis of the two-dimensional model. The interlayer coupling also plays a significant role in the outcome. Good agreement between the model and the experimental results is achieved, except for the case of fields approaching the saturation value applied along the c axis.
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页数：15
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