自旋-轨道耦合绝缘体Ba2MgReO6中Jeff = 3/2四元对称性的连续破缺
Successive Symmetry Breaking in a Jeff = 3/2 Quartet in the Spin-Orbit Coupled Insulator Ba2MgReO6
摘要：
本文报道了含Re ~（6+）离子的立方双钙钛矿Ba_2MgReO_6的5d_1电子组态。电阻率，磁化强度和热容测量使用单晶表明，该化合物是一个莫特绝缘体的磁性转变在Tm = 18 K，这是伴随着一个弱的铁磁矩与[110]各向异性。另一个转变是观察到在Tq = 33 K的热容，其中磁化率的倒数改变其斜率，表明在电子状态的实质性变化。在高于Tq的高温下，有效磁矩约为0.68μB，总电子熵接近Rln 4，这表明自旋-轨道耦合的重要性。这些特征表明Ba_2MgReO_6是一种自旋-轨道耦合的莫特绝缘体，具有Jeff = 3/2四重态，在Tq和Tm处分别呈现四极和偶极级.
英文摘要：
We report on the cubic double perovskite Ba2MgReO6 containing Re6+ ions with the 5d1 electron configuration. Resistivity, magnetization, and heat capacity measurements using single crystals show that the compound is a Mott insulator with a magnetic transition at Tm = 18 K, which is accompanied by a weak ferromagnetic moment with [110] anisotropy. Another transition is observed at Tq = 33 K in heat capacity, where the inverse of magnetic susceptibility changes its slope, indicating a substantial change in the electronic state. The significance of spin-orbit coupling is revealed by the reduced effective magnetic moment of ~0.68μB at high temperature above Tq and the total electronic entropy close to Rln4. These features indicate that Ba2MgReO6 is a spin-orbit coupled Mott insulator possessing a Jeff = 3/2 quartet state, which exhibits quadrupolar and dipolar orders at Tq and Tm, respectively.
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