Time-reversal symmetry breaking hidden order in Sr(2)(Ir,Rh)O(4).
Time-reversal symmetry breaking hidden order in Sr(2)(Ir,Rh)O(4).
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DOI：
10.1038/ncomms15119
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发表时间：
2017-04-24
影响因子：
16.6
通讯作者：
Bourges P
中科院分区：
文献类型：
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作者：
Jeong J;Sidis Y;Louat A;Brouet V;Bourges P
层状5d过渡铱氧化物，Sr 2（Ir，Rh）O 4，被描述为具有强自旋-轨道耦合的非常规Mott绝缘体。未掺杂的化合物，Sr 2 IrO 4，是一个接近理想的二维赝自旋1/2海森堡反铁磁体，类似于高温超导铜氧化物的绝缘母体化合物。利用极化中子衍射，我们在这里报告了一个隐藏的磁秩序在纯和掺杂Sr 2（Ir，Rh）O 4，不同于通常的反铁磁赝自旋排序。我们发现，时间反演对称性被打破，而晶格平移不变性保持在隐藏的顺序阶段。的起始温度相匹配的奇宇称隐藏的顺序最近强调使用光学二次谐波产生实验。新颖的磁序和对称性的破坏可以用以前预测的氧化铜超导体的回路电流模型来解释。探索类似结构的氧化物中的有序态有助于理解结构-性质相关性。在这里，作者发现了一个非常规的磁序在Sr 2（Ir，Rh）O 4，这是类似于具有相同的晶格结构的铜氧化物超导体的回路电流相。
Layered 5d transition iridium oxides, Sr2(Ir,Rh)O4, are described as unconventional Mott insulators with strong spin-orbit coupling. The undoped compound, Sr2IrO4, is a nearly ideal two-dimensional pseudospin-1/2 Heisenberg antiferromagnet, similarly to the insulating parent compound of high-temperature superconducting copper oxides. Using polarized neutron diffraction, we here report a hidden magnetic order in pure and doped Sr2(Ir,Rh)O4, distinct from the usual antiferromagnetic pseudospin ordering. We find that time-reversal symmetry is broken while the lattice translation invariance is preserved in the hidden order phase. The onset temperature matches that of the odd-parity hidden order recently highlighted using optical second-harmonic generation experiments. The novel magnetic order and broken symmetries can be explained by the loop-current model, previously predicted for the copper oxide superconductors. Exploring ordered states in similarly structured oxides aids the understanding of structure-property correlations. Here the authors discover an unconventional magnetic order in Sr2(Ir,Rh)O4, which is analogous to a loop-current phase in cuprate superconductors with the same lattice structure.