Origin of Magnetic Ordering in a Structurally Perfect Quantum Kagome Antiferromagnet.,Physical Review Letters

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Origin of Magnetic Ordering in a Structurally Perfect Quantum Kagome Antiferromagnet.
Physical Review Letters ( IF 8.1 ) Pub Date : 2020-07-08 , DOI: 10.1103/physrevlett.125.027203
T Arh _{1,

2} , M Gomilšek _{1,

3} , P Prelovšek ₁ , M Pregelj ₁ , M Klanjšek ₁ , A Ozarowski ₄ , S J Clark ₃ , T Lancaster ₃ , W Sun ₅ , J-X Mi ₅ , A Zorko _{1,

2}

Affiliation

The ground state of the simple Heisenberg nearest-neighbor quantum kagome antiferromagnetic model is a magnetically disordered spin liquid, yet various perturbations may lead to fundamentally different states. Here we disclose the origin of magnetic ordering in the structurally perfect kagome material

{YCu}_{3} (OH)_{6} {Cl}_{3}

, which is free of the widespread impurity problem. Ab initio calculations and modeling of its magnetic susceptibility reveal that, similar to the archetypal case of herbertsmithite, the nearest-neighbor exchange is by far the dominant isotropic interaction. Dzyaloshinskii-Moriya (DM) anisotropy deduced from electron spin resonance, susceptibility, and specific-heat data is, however, significantly larger than in herbertsmithite. By enhancing spin correlations within kagome planes, this anisotropy is essential for magnetic ordering. Our study isolates the effect of DM anisotropy from other perturbations and unambiguously confirms the predicted phase diagram.

中文翻译：

结构完美的量子Kagome反铁磁体中的磁性有序起源。

简单的海森堡最近邻量子kagome反铁磁模型的基态是一种磁性无序的自旋液体，但是各种扰动可能导致根本不同的状态。在这里，我们揭示了结构完美的kagome材料中磁有序的起源

铜_{3} （ 哦 ）_{6} 氯_{3}

，它没有普遍存在的杂质问题。从头算和磁化率建模表明，与原型铁矿的情况相似，最近邻居交换是主要的各向同性相互作用。但是，由电子自旋共振，磁化率和比热数据得出的Dzyaloshinskii-Moriya（DM）各向异性要比铁矾土大得多。通过增强kagome平面内的自旋相关性，这种各向异性对于磁排序至关重要。我们的研究将DM各向异性的影响与其他扰动隔离开来，并明确确认了预测的相图。

更新日期：2020-07-08

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