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arXiv 0912.4965cond-mat.str-elcond-mat.supr-con
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正方晶格上量子海森堡反铁磁体热力学的线性化自旋波理论

A linearized spin-wave theory for thermodynamics of quantum Heisenberg antiferromagnet on a square lattice

M. M. Liang, Y. H. Su

摘要:

本文用线性化的自旋波理论重新研究了正方晶格上量子海森堡反铁磁体的热力学。详细地重新考察了自由能、内能、熵和比热随温度的变化关系。在我们的线性化自旋波理论中,可以再现以往研究中热力学的大部分结论。特别地,我们在低温$T<J$下的计算与量子蒙特卡罗模拟和高温级数展开在定量上一致。

英文摘要:

The thermodynamics of the quantum Heisenberg antiferromagnet on a square lattice is revisited through a linearized spin-wave theory which is well defined at any finite temperature. We re-examine in details the temperature dependence of the free energy, the internal energy, the entropy and the specific heat. Most conclusions of the thermodynamics in previous studies can be reproduced in our linearized spin-wave theory. Specially, our calculation at low temperature $T<J$ agrees quantitatively with the numerical Quantum Monte Carlo simulation and high temperature series expansions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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