Pressure-induced superconductivity in trigonal layered PtBi2 with triply degenerate point fermions
Pressure-induced superconductivity in trigonal layered PtBi2 with triply degenerate point fermions
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具有三重简并点费米子的三角层状 PtBi2 中的压力诱导超导性
DOI：
10.1103/physrevb.103.014507
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发表时间：
2021
影响因子：
3.7
通讯作者：
Yang Zhaorong
中科院分区：
文献类型：
--
作者：
Wang Jing;Chen Xuliang;Zhou Yonghui;An Chao;Zhou Ying;Gu Chuanchuan;Tian Mingliang;Yang Zhaorong
具有非饱和、超大磁电阻效应的材料在自旋电子学和磁传感器/开关领域具有巨大的应用潜力，因此一直受到人们的关注。在这里，我们报告的发现压力驱动的超导（SC）在三角形，一个半金属材料与非平凡的三重简并点费米子表现出非饱和XMR效应，超过GPa的临界压力。超导转变的起始温度为K，在GPa的宽压力范围内，超导转变与压力的关系很弱。三角形的晶格结构对压力稳定至少到12.9 GPa。在SC出现的相同临界压力附近，霍尔系数变化剧烈，并显示出从低压正（空穴主导）到高压负（电子主导）的符号交叉，可能表明它们之间的密切关系。
Materials with nonsaturating, extremely large magnetoresistance (XMR) attract continuous research interest due to their great potential in the fields of spintronics and magnetic sensors/switches. Here, we report the discovery of pressure-driven superconductivity (SC) in trigonal, a semimetal material with nontrivial triply degenerate point fermions exhibiting a nonsaturating XMR effect, above a critical pressure ofGPa. The superconducting transition onset temperature isK and displays a very weak pressure dependence across a broad pressure range ofGPa. The lattice structure of trigonalis stable against pressure at least to 12.9 GPa. Around the same critical pressure where the SC emerges, the Hall coefficient varies violently and shows a sign crossover from low pressure positive (hole dominated) to high pressure negative (electron dominated), probably indicating a close relationship between them.