arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1702.01671cond-mat.str-el
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$α$ - RuCl中存在场致量子自旋液体的证据$_3$

Evidence for a Field-induced Quantum Spin Liquid in $α$-RuCl$_3$

S. -H. Baek, S. -H. Do, K. -Y. Choi, Y. S. Kwon, A. U. B. Wolter, S. Nishimoto, Jeroen van den Brink, B. Büchner

摘要:

我们报告了在蜂窝晶格中的$^{35}$的核磁共振研究,$α$是一种被认为可能实现Kitaev量子自旋液体(QSL)基态的材料。我们的结果为$α$ -RuCl $_3$具有磁场诱导的QSL提供了直接证据.对于大于$\sim 10$ T的场,自旋隙打开,而共振线保持尖锐,证明自旋是量子无序和局部波动的。自旋带隙随磁场的增加而线性增加,在15 T时达到$\sim50$ K,并且相对于场方向几乎是各向同性的。不寻常的快速增加的自旋间隙增加的领域和其各向同性的性质是不符合传统的磁有序,特别是排除基态是一个完全极化的铁磁体。在Kitaev模型中确实预测了这种场诱导的、有间隙的QSL相的存在。

英文摘要:

We report a $^{35}$Cl nuclear magnetic resonance study in the honeycomb lattice, $α$-RuCl$_3$, a material that has been suggested to potentially realize a Kitaev quantum spin liquid (QSL) ground state. Our results provide direct evidence that $α$-RuCl$_3$ exhibits a magnetic field-induced QSL. For fields larger than $\sim 10$ T a spin-gap opens up while resonance lines remain sharp, evidencing that spins are quantum disordered and locally fluctuating. The spin gap increases linearly with increasing magnetic field, reaching $\sim50$ K at 15 T, and is nearly isotropic with respect to the field direction. The unusual rapid increase of the spin gap with increasing field and its isotropic nature are incompatible with conventional magnetic ordering and in particular exclude that the ground state is a fully polarized ferromagnet. The presence of such a field-induced, gapped QSL phase has indeed been predicted in the Kitaev model.

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