Pressure effect on the topologically nontrivial electronic state and transport of lutecium monobismuthide
Pressure effect on the topologically nontrivial electronic state and transport of lutecium monobismuthide
复制标题
压力对镥的拓扑非平凡电子态和输运的影响
DOI：
10.1103/physrevmaterials.4.124204
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发表时间：
2020-12
影响因子：
3.4
通讯作者：
Y. Fang
中科院分区：
文献类型：
--
作者：
H. Gu;F. Tang;Y.-R. Ruan;J.M. Zhang;R.J. Tang;W. Zhao;R. Zhao;L. Zhang;Z.D. Han;B. Qian;X.F. Jiang;Y. Fang
稀土单肽被预测为非平凡的半金属候选化合物，并表现出压力诱导超导电性。在这里，我们生长了Lubi单晶，并对其磁化、输运行为和电子能带结构进行了研究，以揭示其拓扑半金属化特征和压力下的超导电性。在0 GPa时，量子振荡表明在费米能级周围存在几个拓扑上非平凡的载流子口袋，其中空穴的形状各向同性，而电子的各向异性是导致角磁电阻的原因。在压缩时，超导电性出现在标题为的化合物中，表现出与在Labi中观察到的类似的压力依赖关系。我们的计算表明，电子能带结构在低气压和高气压下都是健壮的，因此拓扑特征始终保持不变。此外，Lubi的近乎与压力无关的态密度表明，常规的电-声子耦合似乎在超导电性中起着次要的作用。
Rare-earth monopnictides are predicted to be nontrivial semimetal candidates and show pressure-induced superconductivity. Here, we grow LuBi single crystal and study the magnetization, transport behaviors and electronic band structures to reveal its topological semimetal feature and superconductivity under pressure. At 0 GPa, the quantum oscillations indicate that there are several topologically nontrivial carrier pockets around the Fermi level, among which the hole ones are isotropic in shape, while the electron ones are anisotropic and responsible for the angular magnetoresistance. Upon compression, the superconductivity emerges in the titled compound, showing a similar pressure dependence as that observed in LaBi. Our calculation suggests that the electronic band structures are robust at low- and high-pressure respectively and thus the topological features are always preserved. Besides, the nearly pressure-independent density of state in LuBi indicates that the conventional electron-phonon coupling appears to play a minor role in the superconductivity.