Pressure-induced evolution of structural and electronic properties in TiTe2
Pressure-induced evolution of structural and electronic properties in TiTe2
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TiTe2 中结构和电子特性的压力诱导演化
DOI：
10.1103/physrevb.99.125104
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发表时间：
2019
影响因子：
3.7
通讯作者：
Zhaorong Yang
中科院分区：
文献类型：
--
作者：
Yonghui Zhou;Chunhua Chen;Ying Zhou;Xuliang Chen;Chuanchuan Gu;Chao An;Bowen Zhang;Yifang Yuan;Hao Wu;Ranran Zhang;Lili Zhang;Xiangde Zhu;Xiaoping Yang;Zhaorong Yang
在常压下，六方晶系、空间群为P-的块状样品具有弱安德森局域化特性的半金属导电性，而在高压下具有超导电性。本文通过将压力扩展到50.2GPa，研究了压缩过程中结构和输运性质的详细演化。结合高压电输运和同步加速器X射线衍射实验解开两个临界压力点。当温度达到100 ℃时，超导体出现，并伴随着由相转变为相和单斜相的结构转变.局域化效应一直持续到结构转变结束，霍尔系数由正变为负。我们的结果表明，高压下的超导电性可以归属于电子主导的高压相。
Bulk(hexagonal, space groupP-) exhibits semimetallic conductivity with weak Anderson localization characteristic at ambient pressure, but superconductivity under high pressure of. Here the detailed evolutions of structural and transport properties induring compression are investigated by extending pressure up to 50.2 GPa. The combined high-pressure electrical transport and synchrotron x-ray diffraction experiments unravel two critical pressure points. At, the superconductivity emerges, which is accompanied by a structural transition fromto a mixture ofand monoclinicphase. The localization effect maintains until the structural transition is over at, meanwhile the Hall coefficientchanges from positive to negative. Our results demonstrate that the superconductivity in the pressurizedcan be assigned to the high-pressurephase which is electron dominated.