Green-function study of the J1-J2-Jc spin-exchange model for BaMn2As2
作者： Huan Li
DOI: 10.1209/0295-5075/99/17007
关键词: Heisenberg model 、 Decoupling (cosmology) 、 Spin-½ 、 Exchange model 、 Condensed matter physics 、 Physics 、 Anisotropy 、 Néel temperature 、 Magnetization
摘要: The magnetic properties of BaMn2As2 are investigated in the framework J1-J2-Jc Heisenberg model. Based on equation-of-motion decoupling Green's functions for local moments, we derive analytic formulas Neel temperature, staggered magnetization and anisotropic spin susceptibility. By comparing theoretical predictions with corresponding experimental data, exchange couplings estimated to be J1 ≈ 11.4 meV, J2/J1 ≈ 0.2, Jc/J1 ≈ 0.1. satisfactory fits measured susceptibility by results indicate that Green-function method provides a rather good description this local-moment
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