Pressure-induced superconductivity in MoP
Pressure-induced superconductivity in MoP
复制标题
MoP 中的压力诱导超导
DOI：
10.1038/s41535-018-0102-7
复制
发表时间：
2018-05-30
影响因子：
5.7
通讯作者：
Yang, Zhaorong
中科院分区：
文献类型：
--
作者：
Chi, Zhenhua;Chen, Xuliang;Yang, Zhaorong
拓扑半金属态是一种新的量子态，具有非平凡能带拓扑所决定的奇异量子涌现现象，是凝聚态物理学的一个新的前沿。最近，三重简并带交叉点和费米能级附近的外尔点的共存在理论上预测和实验上确定在MoP。通过高压电输运测量，我们在这里报告的压力诱导的超导电性的出现在MoP的临界转变温度Tc约。2.5 K在。30 GPa。没有观察到结构相变高达约。60 GPa通过同步辐射X射线衍射研究。因此，由晶体结构对称性和超导性保护的拓扑非平凡带预计将在30 GPa以上的压力下共存，与密度泛函理论计算一致。因此，加压MoP代表了拓扑超导体的一个有希望的候选者。我们的研究结果有望促进对新型非常规费米子系统中奇异量子涌现现象的进一步研究。
Topological semimetal, a novel state of quantum matter hosting exotic emergent quantum phenomena dictated by the nontrivial band topology, has emerged as a new frontier in condensed-matter physics. Very recently, the coexistence of triply degenerate points of band crossing and Weyl points near the Fermi level was theoretically predicted and experimentally identified in MoP. Via high-pressure electrical transport measurements, we report here the emergence of pressure-induced superconductivity in MoP with a critical transition temperature Tc of ca. 2.5 K at ca. 30 GPa. No structural phase transition is observed up to ca. 60 GPa via synchrotron X-ray diffraction study. Accordingly, the topologically nontrivial band protected by the crystal structure symmetries and superconductivity are expected to coexist at pressures above 30 GPa, consistent with density functional theory calculations. Thus, the pressurized MoP represents a promising candidate of topological superconductor. Our finding is expected to stimulate further exploitation of exotic emergent quantum phenomena in novel unconventional fermion system.