Honeycomb lattice iridate on the verge of Mott-collapse
Honeycomb lattice iridate on the verge of Mott-collapse
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处于莫特塌陷边缘的蜂窝晶格虹彩
DOI：
10.1088/1361-648x/ac916e
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Katori Hiroko Aruga
中科院分区：
文献类型：
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作者：
Haraguchi Yuya;Katori Hiroko Aruga
以自旋-轨道耦合Mott绝缘体Na 2 IrO 3为原料，用La 3+离子取代层间Na+离子，成功合成了一种新型蜂窝晶格铱酸盐（La，Na）IrO 3（LaNaIr 2 O 6）. (La，Na）IrO 3在热容和电阻率的− lnT依赖性中显示出有限的索末菲项，表明由莫特塌缩驱动的金属态的实现。此外，晶体结构分析揭示了金属-金属键合的Ir之字形链的形成，增加了导致Mott崩塌的动能。这一观察结果将是由于莫特崩溃中诱导的Jeff = 1/2自旋-轨道耦合莫特绝缘体与Ir蜂窝晶格的离子配置的拓扑化学控制。
A new honeycomb lattice iridate (La, Na) IrO 3 (≈ LaNaIr 2 O 6) is successfully synthesized from the spin–orbit coupled Mott insulator Na 2 IrO 3 by replacing the interlayer Na+ ions with La 3+ ions.(La, Na) IrO 3 shows a finite Sommerfeld term in heat capacity and a− lnT dependence of resistivity, indicating a realization of a metallic state driven by a Mott collapse. Furthermore, crystal structure analysis reveals the formation of Ir zig-zag chains with metal–metal bonding, increasing kinetic energy resulting in the Mott collapse. This observation would be due to a Mott collapse induced in a J eff= 1/2 spin–orbit coupling Mott insulator with an Ir honeycomb lattice by topochemical control of the ionic configuration.