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arXiv 1010.4476cond-mat.str-elcond-mat.mtrl-sci
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Dzyaloshinskiii-Moriya相互作用对SrCu2(BO3)的phase diagram和磁激发的影响

The effect of Dzyaloshinskii-Moriya interactions on the phase diagram and magnetic excitations of SrCu2(BO3)2

Judit Romhanyi, Keisuke Totsuka, Karlo Penc

摘要:

SrCu 2(BO 3)2自旋1/2磁体中的正交二聚体结构提供了Shastry-Sutherland模型的实现。利用二聚体乘积变分波函数,我们绘制了包含各向异性的Shastry-Sutherland模型的相图。基于变分解,我们构造了一种键波方法,得到了激发光谱随磁场的变化关系。实验测得的中子和ESR谱的特征再现,如各向异性诱导零场分裂和持久的差距在较高的领域。

英文摘要:

The orthogonal dimer structure in the SrCu2(BO3)2 spin-1/2 magnet provides a realization of the Shastry-Sutherland model. Using a dimer-product variational wave function, we map out the phase diagram of the Shastry-Sutherland model including anisotropies. Based on the variational solution, we construct a bond-wave approach to obtain the excitation spectra as a function of magnetic field. The characteristic features of the experimentally measured neutron and ESR spectra are reproduced, like the anisotropy induced zero field splittings and the persistent gap at higher fields.

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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