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arXiv 1608.06205cond-mat.str-el
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具有层间竞争耦合的Sr $_2$ IrO $_4$ - 2D $J_{\rm eff}$ = 1/2 Heisenberg体系磁化率的模型分析

Model analysis of magnetic susceptibility of Sr$_2$IrO$_4$ - 2D $J_{\rm eff}$ = 1/2 Heisenberg system with competing interlayer couplings

Tomohiro Takayama, Akiyo Matsumoto, George Jackeli, Hidenori Takagi

摘要:

本文报道了Sr $_2$ IrO $_4$单晶顺磁相的磁化率$χ$($T$)的分析。我们制定的理论磁化率的基础上,各向同性海森堡反铁磁性纳入Dzyaloshinsky-Moriya相互作用,并包括层间耦合的平均场近似。发现高于$T_{\rm N}$的$χ$($T$)被模型很好地描述,表明主要的海森堡交换与微观理论一致。分析指出,最近和次最近邻层间耦合的竞争,这导致在向上-向上-向下-向下配置的衍射实验确定的面内倾斜力矩。

英文摘要:

We report the analysis of magnetic susceptibility $χ$($T$) of Sr$_2$IrO$_4$ single crystal in the paramagnetic phase. We formulate the theoretical susceptibility based on isotropic Heisenberg antiferromagnetism incorporating the Dzyaloshinsky-Moriya interaction exactly, and include the interlayer couplings in a mean-field approximation. $χ$($T$) above $T_{\rm N}$ was found to be well described by the model, indicating the predominant Heisenberg exchange consistent with the microscopic theory. The analysis points to a competition of nearest and next-nearest neighbor interlayer couplings, which results in the up-up-down-down configuration of the in-plane canting moments identified by the diffraction experiments.

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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