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arXiv 1301.0976cond-mat.supr-con
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具有费米面拓扑跃迁的非中心对称超导体的自旋磁化率

Spin Susceptibility in Non-centrosymmetric Superconductors with Topological Transition of Fermi Surfaces

Daisuke Maruyama, Youichi Yanase

摘要:

非中心对称超导体Li_2Pd_3B和Li_2Pt_3B尽管具有相同的晶体对称性,但表现出不同的超导性质。受实验结果的启发,我们研究了非中心对称超导体的自旋磁化率,并通过第一性原理能带结构计算指出了由于反对称自旋-轨道耦合引起的费米面拓扑转变.我们研究了三种类型的拓扑转变,即(A)费米面消失,(B)通过狄拉克点,(C)通过鞍点van-Hove奇点。超导态的自旋磁化率通过拓扑跃迁(A)和(C)增加,而通过(B)降低。我们讨论了不寻常的磁性观察Li 2 Pt 3B的基础上,这些结果。

英文摘要:

The non-centrosymmetric superconductors Li2Pd3B and Li2Pt3B show different superconducting properties despite having the same crystal symmetry. Motivated by experimental results, we investigate the spin susceptibility of non-centrosymmetric superconductors accompanied by the topological transition of Fermi surfaces due to antisymmetric spin-orbit coupling, which is indicated by the first-principles band structure calculation for Li2Pt3B. We study three types of topological transition, namely, (A) the disappearance of the Fermi surface, (B) crossing the Dirac point, and (C) crossing the saddle point van-Hove singularity. The spin susceptibility in the superconducting state is increased by the topological transitions (A) and (C), while it is decreased by (B). We discuss the unusual magnetic properties observed in Li2Pt3B on the basis of these results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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