三重兼并费米子拓扑半金属MoP高压超导相的低压截获  

Interception of High-Pressure Superconducting Phase of Triply Degenerated Fermion Topological Semimetal MoP at Low Pressure

作　　者：陈兆亮 迟振华 崔田 CHEN Zhaoliang;CHI Zhenhua;CUI Tian(Institute of High Pressure Physics,School of Physical Science and Technology,Ningbo University,Ningbo 315211)

机构地区：[1]宁波大学物理科学与技术学院高压物理科学研究院,宁波315211

出　　处：《低温物理学报》2023年第1期50-54,共5页Low Temperature Physical Letters

基　　金：宁波大学科研启动项目(批准号:ZX2022000142);浙江省科技创新团队项目(批准号:2021R01004)资助的课题。

摘　　要：碳化钨结构的三重兼并费米子拓扑半金属MoP高压下发生超导转变,然而,高压超导相能否在低压甚至常压截获尚不清楚.本文对两个密封于金刚石对顶砧中的MoP高压超导相在室温条件下进行快速卸压,通过测量低温电阻对温度的依赖关系,验证能否在低压甚至常压截获高压超导相.实验结果表明:初始压力61.5 GPa的样品#1,超导电性可截获的最低压力为44.2 GPa;初始压力95.0 GPa的样品#2,超导电性可截获的最低压力为3.5 GPa.The triply degenerated fermion host topological semimetal MoP is pressurized to exhibit superconductivity.However,whether the high-pressure superconducting phase could be intercepted at ambient pressure or not is unclear.In this paper,we rapidly decompress two high-pressure superconducting phases sealed in the sample chamber of diamond anvil cell at room temperature,in order to check the possibility of interception at ambient pressure.It is demonstrated that the high-pressure superconducting phase of sample #1 could be intercepted at 44.2 GPa,and the high-pressure superconducting phase of sample #2 could be intercepted at 3.5 GPa.The high-pressure superconducting phase potentially to be intercepted at ambient pressure is a promising candidate of topological superconductor.

关 键 词：高压 三重兼并费米子拓扑半金属 超导电性 低压截获 

分 类 号：O469[理学—凝聚态物理]