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arXiv 1811.00565cond-mat.str-elcond-mat.mtrl-sci
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Kitaev自旋液体材料Cu2IrO3的静、动态磁性竞争

Competition between static and dynamic magnetism in the Kitaev spin liquid material Cu2IrO3

Eric M. Kenney, Carlo U. Segre, William Lafargue-Dit-Hauret, Oleg I. Lebedev, Mykola Abramchuk, Adam Berlie, Stephen P. Cottrell, Gediminas Simutis, Faranak Bah… 展开作者

Eric M. Kenney, Carlo U. Segre, William Lafargue-Dit-Hauret, Oleg I. Lebedev, Mykola Abramchuk, Adam Berlie, Stephen P. Cottrell, Gediminas Simutis, Faranak Bahrami, Natalia E. Mordvinova, Jessica. L. McChesney, Gilberto Fabbris, Daniel Haskel, Xavier Rocquefelte, Michael J. Graf, Fazel Tafti

摘要:

从Kitaev自旋液体中出现的任何子激发可以形成量子计算机的基础。寻找这样的激发激发了对蜂窝状铱酸盐材料的深入研究。然而,进入自旋液体基态受到磁有序的阻碍。Cu_2IrO_3是一种新型的蜂窝状铱酸盐,没有长程序热力学特征。在这里,我们使用μ子自旋弛豫揭示磁性基态的Cu 2 IrO 3。我们发现一个两个组件的退极化慢,快弛豫率对应于不同的区域,分别与动态和静态磁性。X射线吸收光谱和第一性原理计算确定了混合铜价作为这种行为的起源。我们的研究结果表明,少数的Cu 2+离子成核区域的静态磁性,而大多数的Cu +/Ir 4+的蜂窝晶格上产生的Kitaev自旋液体。

英文摘要:

Anyonic excitations emerging from a Kitaev spin liquid can form a basis for quantum computers. Searching for such excitations motivated intense research on the honeycomb iridate materials. However, access to a spin liquid ground state has been hindered by magnetic ordering. Cu2IrO3 is a new honeycomb iridate without thermodynamic signatures of a long-range order. Here, we use muon spin relaxation to uncover the magnetic ground state of Cu2IrO3. We find a two-component depolarization with slow and fast relaxation rates corresponding to distinct regions with dynamic and static magnetism, respectively. X-ray absorption spectroscopy and first principles calculations identify a mixed copper valence as the origin of this behavior. Our results suggest that a minority of Cu2+ ions nucleate regions of static magnetism whereas the majority of Cu+/Ir4+ on the honeycomb lattice give rise to a Kitaev spin liquid.

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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