Metastable Kitaev Magnets.

Metastable Kitaev Magnets.
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DOI:
10.3390/molecules27030871
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发表时间:
2022-01-27
期刊:
Molecules (Basel, Switzerland)
影响因子:
--
通讯作者:
Tafti F
Tafti F
中科院分区:
其他
文献类型:
--
作者:
Bahrami F;Abramchuk M;Lebedev O;Tafti F

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近20年前,Alexei Kitaev提出了一个二维蜂窝晶格上具有键定向相互作用的自旋粒子模型,该模型有可能拥有量子自旋液体基态。这项工作引发了许多研究,设计和合成材料,将物理实现基塔耶夫汉密尔顿量。第一代这样的材料,如NaIrO, -LiIrO和-RuCl,揭示了非基塔耶夫相互作用的存在,如海森堡和非对角线交换。物理压力和化学掺杂都被用来调节基塔耶夫和竞争相互作用的相对强度;然而,在实现纯粹的基塔耶夫系统方面进展甚微。在这里,我们回顾了最近通过拓扑化学方法修饰基塔耶夫磁体的突破,这导致了第二代基塔耶夫材料的出现。我们展示了由于拓扑交换反应引起的结构修饰如何改变磁相互作用,从而有利于量子自旋液相。
Nearly two decades ago, Alexei Kitaev proposed a model for spin- particles with bond-directional interactions on a two-dimensional honeycomb lattice which had the potential to host a quantum spin-liquid ground state. This work initiated numerous investigations to design and synthesize materials that would physically realize the Kitaev Hamiltonian. The first generation of such materials, such as NaIrO, -LiIrO, and -RuCl, revealed the presence of non-Kitaev interactions such as the Heisenberg and off-diagonal exchange. Both physical pressure and chemical doping were used to tune the relative strength of the Kitaev and competing interactions; however, little progress was made towards achieving a purely Kitaev system. Here, we review the recent breakthrough in modifying Kitaev magnets via topochemical methods that has led to the second generation of Kitaev materials. We show how structural modifications due to the topotactic exchange reactions can alter the magnetic interactions in favor of a quantum spin-liquid phase.
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