论文标题
电子准水术与Pyrochlore中的无序量子交织在一起
Electron quasi-itinerancy intertwined with quantum order by disorder in pyrochlore iridate magnetism
论文作者
论文摘要
我们指出了磁性启发的电子准渗服的相互作用和量子序列中的磁性的出现。像其他绝缘触发物一样，pyrochlore iridates中的ir $^{4+} $ ion从现场旋转轨道耦合中开发出有效的$ {j = 1/2} $矩。我们考虑这些局部力矩在pyrochlore晶格上之间的通用对称性交换，并获得平均场相图。假设甲基次数是通过中间氧气跳跃和/或间接电子跳的介导的，我们会从哈伯德模型中得出强耦合方案中的交换相互作用。该交换具有退化的经典基态歧管，量子波动选择了非稳态的基态，称为量子序列。延伸到中间耦合方案，从动能中选择了相同的非链球阶顺序，该阶数被称为“电子准级缩水”。我们讨论了我们的结果和电子准水液的实验相关性，以及$ 4D/5D $磁铁的实验相关性。
We point out the emergence of magnetism from the interplay of electron quasi-itinerancy and quantum order by disorder in pyrochlore iridates. Like other Mott insulating iridates, the Ir$^{4+}$ ion in pyrochlore iridates develops an effective ${J=1/2}$ moment from the on-site spin-orbit coupling. We consider the generic symmetry-allowed exchange between these local moments on a pyrochlore lattice and obtain the mean-field phase diagram. Assuming the superexchange is mediated by direct and/or indirect electron hopping via intermediate oxygens, we derive the exchange interactions in the strong coupling regime from the Hubbard model. This exchange has a degenerate classical ground state manifold and quantum fluctuation selects a non-coplanar ground state, known as quantum order by disorder. Extending to the intermediate coupling regime, the same non-coplanar order is selected from the degenerate manifold by the kinetic energy, which is dubbed "electron quasi-itinerancy". We discuss the experimental relevance of our results and electron quasi-itinerancy among other iridates and $4d/5d$ magnets.
