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首页> 外文期刊>Physical review >Unified theory of spiral magnetism in the harmonic-honeycomb iridates α, β, and γ Li_2IrO_3
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Unified theory of spiral magnetism in the harmonic-honeycomb iridates α, β, and γ Li_2IrO_3

机译:谐蜂窝形铱酸盐α,β和γLi_2IrO_3中螺旋磁的统一理论

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摘要

A family of insulating iridates with chemical formula Li_2IrO_3 has recently been discovered, featuring three distinct crystal structures α, β, γ (honeycomb, hyperhoneycomb, stripy honey comb). Measurements on the three-dimensional polytypes, β- and γ-Li_2IrO_3, found that they magnetically order into remarkably similar spiral phases, exhibiting a noncoplanar counter-rotating spiral magnetic order with equivalent q = 0.57 wave vectors. We examine magnetic Hamiltonians for this family and show that the same triplet of nearest-neighbor Kitaev-Heisenberg-Ising (K J I) interactions reproduces this spiral order on both β- and γ-Li_2IrO_3 structures. We analyze the origin of this phenomenon by studying the model on a one-dimensional zigzag chain, a structural unit common to the three polytypes. The zigzag-chain solution transparently shows how the Kitaev interaction stabilizes the counter-rotating spiral, which is shown to persist on restoring the interchain coupling. Our minimal model makes a concrete prediction for the magnetic order in α-Li_2IrO_3.
机译:最近发现了一个化学式为Li_2IrO_3的绝缘铱酸盐家族,具有三个不同的晶体结构α,β,γ(蜂窝状,超蜂窝状,条状蜜梳)。对三维多型β-和γ-Li_2IrO_3的测量发现,它们的磁序为非常相似的螺旋相,表现出具有等价q = 0.57波矢的非共面反向旋转螺旋磁序。我们检查了该族的磁性哈密顿量,并表明相同的三邻邻Kitaev-Heisenberg-Ising(K J I)相互作用在β-和γ-Li_2IrO_3结构上均重现了这种螺旋顺序。我们通过研究一维之字形链上的模型来分析此现象的起源,该模型是三种多型共同的结构单元。之字形链解决方案透明地显示了Kitaev相互作用如何稳定反向旋转螺线,该反向螺线显示在恢复链间耦合方面持续存在。我们的最小模型对α-Li_2IrO_3中的磁阶做出了具体的预测。

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