Magnetic phase diagram of a spatially anisotropic, frustrated spin-1/2 Heisenberg antiferromagnet on a stacked square lattice

被引：22
作者：
Majumdar, Kingshuk [1 ]
机构：
[1] Grand Valley State Univ, Dept Phys, Allendale, MI 49401 USA
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 2011年 / 23卷 / 04期
基金：
美国国家科学基金会;
关键词：
SIMPLE CUBIC LATTICES; WAVE THEORY; QUANTUM FLUCTUATIONS; MAGNON DISPERSION; 1/S EXPANSION; SUPERCONDUCTIVITY; TRANSITION; DYNAMICS; SERIES; ORDER;
D O I：
10.1088/0953-8984/23/4/046001
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The magnetic phase diagram of a spatially anisotropic, frustrated spin-1/2 Heisenberg antiferromagnet on a stacked square lattice is investigated using a second-order spin-wave expansion. The effects of interlayer coupling and the spatial anisotropy on the magnetic ordering of two ordered ground states are explicitly studied. It is shown that with increase in next nearest neighbor frustration the second-order corrections play a significant role in stabilizing the magnetization. We obtain two ordered magnetic phases (Neel and stripe) separated by a paramagnetic disordered phase. Within the second-order spin-wave expansion we find that the width of the disordered phase diminishes with increase in the interlayer coupling or with decrease in spatial anisotropy but it does not disappear. Our obtained phase diagram differs significantly from the phase diagram obtained using linear spin-wave theory.
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页数：9
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