Nonequilibrium orbital transitions via applied electrical current in calcium ruthenates
Nonequilibrium orbital transitions via applied electrical current in calcium ruthenates
复制标题
通过在钌酸钙中施加电流实现非平衡轨道跃迁
DOI:
10.1103/physrevb.100.241104
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发表时间:
2019
影响因子:
3.7
通讯作者:
Cao, Gang
中科院分区:
文献类型:
--
作者:
Zhao, Hengdi;Hu, Bing;Ye, Feng;Hoffmann, Christina;Kimchi, Itamar;Cao, Gang
Simultaneous control of structural and physical properties via applied electrical current poses a new, key research topic with both fundamental and technological significance. Studying the spin-orbit-coupled antiferromagnet, and its derivative with 3% Mn doping to alleviate the violent first-order transition at 357 K, we find that a small applied electrical current couples to the lattice by significantly reducing its orthorhombic distortions and octahedral rotations, while concurrently diminishing the 125-K antiferromagnetic transition. Further increasing electrical current density aboveinduces a new nonequilibrium orbital state, with a transition signature at 80 K that features a simultaneous jump in both magnetization and electrical resistivity, sharply contrasting the current-free state. We argue that nonequilibrium electron occupancies of theorbitals stabilized by applied current drive the observed lattice changes and thereby the novel phenomena in this system. Finally, we note that current-induced diamagnetism reported in recent literature [C. Sow , Science 358, 1084 (2017).10.1126/science.aah4297] is not discerned in either slightly doped or pure.
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