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arXiv 2102.08964cond-mat.str-el
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$j_{\rm eff}$磁体的修正居里-外斯定律

Modified Curie-Weiss Law for $j_{\rm eff}$ Magnets

Ying Li, Stephen M. Winter, David A. S. Kaib, Kira Riedl, Roser Valenti

摘要:

在自旋-轨道耦合磁性材料中,通常应用的居里-外斯定律可能被打破。这是由于局部磁矩的潜在急剧温度依赖性。因此,我们提出了一个修正的居里-外斯公式适合于实验磁化率分析。我们表明,八面体配位材料的$d^5$填充的Weiss常数从改进的公式得到的微观交换相互作用的计算结果与良好的协议。重新分析几个Kitaev候选材料的测量磁化率与修改后的公式解决了各种实验之间的明显差异的幅度和各向异性的基础磁耦合。

英文摘要:

In spin-orbit-coupled magnetic materials, the usually applied Curie-Weiss law can break down. This is due to potentially sharp temperature-dependence of the local magnetic moments. We therefore propose a modified Curie-Weiss formula suitable for analysis of experimental susceptibility. We show for octahedrally coordinated materials of $d^5$ filling that the Weiss constant obtained from the improved formula is in excellent agreement with the calculated Weiss constant from microscopic exchange interactions. Reanalyzing the measured susceptibility of several Kitaev candidate materials with the modified formula resolves apparent discrepancies between various experiments regarding the magnitude and anisotropies of the underlying magnetic couplings.

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