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arXiv 1109.0979cond-mat.supr-concond-mat.mes-hall
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拓扑半金属YPtBi的超导电性

Superconductivity in the topological semimetal YPtBi

Nicholas P. Butch, P. Syers, Kevin Kirshenbaum, Andrew P. Hope, Johnpierre Paglione

摘要:

非中心对称的Half Heusler化合物YPtBi在低于临界温度Tc = 0.77 K时具有超导电性,零温上临界场Hc 2(0)= 1.5 T。磁阻和霍尔测量结果支持了理论预测,即这种材料是一种拓扑上非平凡的半金属,其正电荷载流子密度低得惊人,仅为2 x 10^18 cm^-3。Shubnikov-de Haas振荡中的非常规线性磁电阻和拍频指向自旋轨道分裂费米面。磁阻对表面粗糙度的敏感性表明表面态可能有贡献。YPtBi的非中心对称性和强自旋轨道耦合的结合为拓扑超导电性的研究提供了一个很有前途的平台。

英文摘要:

The noncentrosymmetric Half Heusler compound YPtBi exhibits superconductivity below a critical temperature T_c = 0.77 K with a zero-temperature upper critical field H_c2(0) = 1.5 T. Magnetoresistance and Hall measurements support theoretical predictions that this material is a topologically nontrivial semimetal having a surprisingly low positive charge carrier density of 2 x 10^18 cm^-3. Unconventional linear magnetoresistance and beating in Shubnikov-de Haas oscillations point to spin-orbit split Fermi surfaces. The sensitivity of magnetoresistance to surface roughness suggests a possible contribution from surface states. The combination of noncentrosymmetry and strong spin-orbit coupling in YPtBi presents a promising platform for the investigation of topological superconductivity.

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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