Anomalous changes of electric quadrupole order at low temperatures in the spin-orbit coupled metal Cd2Re2O7
Anomalous changes of electric quadrupole order at low temperatures in the spin-orbit coupled metal Cd2Re2O7
复制标题
自旋轨道耦合金属Cd2Re2O7低温下电四极级数的异常变化
DOI：
10.1103/physrevb.102.155131
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发表时间：
2020
影响因子：
3.7
通讯作者：
Hasegawa T.
中科院分区：
文献类型：
--
作者：
Uji S.;Sugiura S.;Hirose H. T.;Terashima T.;Matsubayashi Y.;Hirai D.;Hiroi Z.;Hasegawa T.
已经对自旋轨道耦合金属进行了磁扭矩测量，以研究与反演对称性破缺相关的独特多极级数。作为场角函数的扭矩曲线被分解为两项，四重对称项 ()，对应于电四极级，以及双重对称项 ()，可能对应于低温下的电环形四极级。低于 20 K，在超导转变过程中观察到大相变后四重对称项的强烈增强，而在双重对称项中没有明显的这种行为。结果表明，低温下电四极级数发生了异常变化。
Magnetic torque measurements in the spin-orbit coupled metalhave been performed to investigate unique multipole orders associated with inversion symmetry breaking. The torque curves as a function of field angle are decomposed into two terms, a fourfold symmetry term (), corresponding to an electric quadrupole order, and a twofold symmetry term (), likely corresponding to an electric toroidal quadrupole order at low temperatures. Below 20 K, a strong enhancement of the fourfold symmetry term following a large phase change is observed toward the superconducting transition whereas no such behavior is evident in the twofold symmetry term. The results show anomalous changes of the electric quadrupole order at the low temperatures.