二维层状材料FePSe_(3)的高压物性  

Physical Properties of Two-Dimensional Layered FePSe_(3) under High Pressure

作　　者：郑飞力 颜建 黄艳萍 罗轩 迟振华 吕心邓 崔田 ZHENG Feili;YAN Jian;HUANG Yanping;LUO Xuan;CHI Zhenhua;LYU Xindeng;CUI Tian(Institute of High Pressure Physics,School of Physical Science and Technology,Ningbo University,Ningbo 315211,Zhejiang,China;Key Laboratory of Materials Physics,Institute of Solid State Physics,Hefei Institute of Material Sciences,Chinese Academy of Sciences,Hefei 230031,Anhui,China;State Key Laboratory of Superhard Materials,College of Physics,Jilin University,Changchun 130012,Jilin,China)

机构地区：[1]宁波大学高压物理科学研究院,物理科学与技术学院,浙江宁波315211 [2]中国科学院合肥物质科学研究院固体物理研究所材料物理重点实验室,安徽合肥230031 [3]吉林大学超硬材料国家重点实验室,物理学院,吉林长春130012

出　　处：《高压物理学报》2023年第2期1-9,共9页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(52072188);浙江省科技创新团队项目(2021R01004);宁波市科技计划项目(2021J121)。

摘　　要：FePSe_(3)在高压下会出现半导体到金属的转变、超导电性以及高自旋到低自旋的转变等多种有趣的物理现象,但目前对其在高压下的晶体结构分析仍以理论研究为主,结构的不确定阻碍了对其物理性质的深入研究。为此,利用金刚石对顶砧结合高压拉曼光谱、高压同步辐射X射线衍射以及高压电输运测量,对FePSe_(3)在高压下的行为进行了研究。结果表明,FePSe_(3)在低于60.0 GPa的压力范围内经历了3次结构相变,完成了LP—HP1—HP2—HP3的转变。首次在实验上观测到FePSe_(3)的高压新相HP2和HP3,并给出其可能的空间对称群。HP2相和HP3相具有超导电性,超导温度随压力的升高而降低,致使超导相图呈现“穹顶”状。研究结果为进一步厘清FePSe_(3)的压致相变行为提供了重要的实验支撑。A variety of interesting physical phenomena such as semiconductor-metal transition,superconductivity,and high spin-low spin transition in FePSe_(3) can be realized under high pressure.However,the current results of its crystal structures under high pressure are mainly based on theoretical research,and the uncertainty of its structure hinders the in-depth study of its physical properties.In this paper,the behavior of FePSe_(3) under high pressure was studied by using diamond anvil cell,Raman spectroscopy,synchrotron X-ray diffraction and electrical transport measurement.The results clearly show that FePSe_(3) undergoes three structural transitions in the pressure range of 0–60.0 GPa,completing a transition of LP–HP1–HP2–HP3.The two new high pressure phases,HP2 and HP3,were observed experimentally for the first time,and the possible space groups were discussed.The superconducting transition temperature measured in HP2 and HP3 typically decrease with increasing pressure,leading to a dome-shaped superconducting diagram.This paper provides important experimental support for further clarifying the pressure-induced phase transition behavior of FePSe_(3).

关 键 词：高压 FePSe_(3) 结构相变 超导电性 

分 类 号：O521.2[理学—高压高温物理]