Magnetic Field-Induced Insulator-Semimetal Transition in a Pyrochlore Nd2Ir2O7
Magnetic Field-Induced Insulator-Semimetal Transition in a Pyrochlore Nd2Ir2O7
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DOI：
10.1103/physrevlett.115.056402
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发表时间：
2015-07-30
影响因子：
8.6
通讯作者：
Tokura, Y.
中科院分区：
文献类型：
--
作者：
Ueda, K.;Fujioka, J.;Tokura, Y.
研究了焦绿石型Nd2Ir2O7单晶的磁输运性质。在全进全出型Ir 5d矩有序绝缘体态的反铁磁畴壁上观察到金属导电性，其可以通过外部磁场沿着进行精细控制[111]。另一方面，施加的磁场沿着[001]诱导体相转变从绝缘体到半金属作为场诱导的修改的结果的Nd 4f和Ir 5d的时刻配置。一致描述实验观察到的功能的理论计算表明，各种奇异的拓扑状态作为电子相关性和Ir 5d矩阶的函数，这可以通过选择稀土离子和磁场进行微调，分别。
We investigate magnetotransport properties in a single crystal of pyrochore-type Nd2Ir2O7. The metallic conduction is observed on the antiferromagnetic domain walls of the all-in-all-out-type Ir 5d moment ordered insulating bulk state that can be finely controlled by an external magnetic field along [111]. On the other hand, an applied field along [001] induces the bulk phase transition from insulator to semimetal as a consequence of the field-induced modification of the Nd 4f and Ir 5d moment configurations. A theoretical calculation consistently describing the experimentally observed features suggests a variety of exotic topological states as functions of electron correlation and Ir 5d moment orders, which can be finely tuned by the choice of rare-earth ion and magnetic field, respectively.