二维层状材料FePSe<sub>3</sub>的高压物性

郑飞力; 颜建; 黄艳萍; 罗轩; 迟振华; 吕心邓; 崔田

doi:10.11858/gywlxb.20230617

二维层状材料FePSe₃的高压物性

doi: 10.11858/gywlxb.20230617

郑飞力^1,,
颜建²,
黄艳萍^1,*, ,,
罗轩^2,*, ,,
迟振华¹,
吕心邓¹,
崔田^{1, 3,*, ,}

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

基金项目: 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）

详细信息

作者简介:
郑飞力（1997－），男，硕士研究生，主要从事高压下二维超导材料的结构与性质研究.E-mail：zhengfeili@yeah.net

通讯作者:
黄艳萍（1987－），女，博士，副教授，主要从事高压下凝聚态物质的结构与性质研究.E-mail：huangyanping@nbu.edu.cn

罗　轩（1981－），男，博士，研究员，主要从事量子关联单晶材料的制备和物性研究.E-mail：xluo@issp.ac.cn

崔　田（1964－），男，博士，教授，主要从事高压等极端条件下新型功能材料的设计与合成研究.E-mail：cuitian@nbu.edu.cn

中图分类号: O521.2
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出版历程
- 收稿日期: 2023-02-17
- 修回日期: 2023-03-15
- 网络出版日期: 2023-04-12
- 刊出日期: 2023-04-05

Physical Properties of Two-Dimensional Layered FePSe₃ under High Pressure

ZHENG Feili^1
,,
YAN Jian²,
HUANG Yanping^{1,*
, ,},
LUO Xuan^{2,*
, ,},
CHI Zhenhua¹,
LYU Xindeng¹,
CUI Tian^{1, 3,*
, ,}

1.
Institute of High Pressure Physics, School of Physical Science and Technology, Ningbo University, Ningbo 315211, Zhejiang, China
2.
Key Laboratory of Materials Physics, Institute of Solid State Physics, Hefei Institute of Material Sciences, Chinese Academy of Sciences, Hefei 230031, Anhui, China
3.
State Key Laboratory of Superhard Materials, College of Physics, Jilin University, Changchun 130012, Jilin, China

摘要

摘要: FePSe₃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FePSe₃在高压下的行为进行了研究。结果表明，FePSe₃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FePSe₃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FePSe₃的压致相变行为提供了重要的实验支撑。
- 高压 /
- FePSe₃ /
- 结构相变 /
- 超导电性
Abstract: A variety of interesting physical phenomena such as semiconductor-metal transition, superconductivity, and high spin-low spin transition in FePSe₃ 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 FePSe₃ 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 FePSe₃ 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 FePSe₃.
- high pressure /
- FePSe₃ /
- structural phase transition /
- superconductivity

HTML全文

图 1 沿a轴 (a)和c轴(b)方向观察的FePSe₃的常压晶体结构示意图

Figure 1. Crystal structure of FePSe₃ viewed along the a-axis (a) and the c-axis (b) under ambient pressure

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图 2 常温常压下FePSe₃的XRD谱(a)和拉曼谱(b)

Figure 2. XRD pattern (a) and Raman spectrum (b) of FePSe₃ measured at room temperature and ambient pressure

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图 3 不同压力下FePSe₃的XRD谱（“*”代表有新峰出现）以及0.3、11.2、39.2、53.4 GPa压力下的结构精修图

Figure 3. XRD patterns of FePSe₃ at selected pressures (asterisk indicates new peak) and the refined XRD patterns of FePSe₃ at 0.3, 11.2, 39.2 and 53.4 GPa, respectively

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图 4 (a) 体积随压力的变化（虚线表示Birch-Murnaghan方程^[26]拟合结果），(b) 晶胞参数随压力的变化

Figure 4. Pressure dependence of (a) volume (the dotted line represents the fitting of Birch-Murnaghan equation^[26]) and (b) cell parameters

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图 5 不同压力下的拉曼光谱(a)以及拉曼频率随压力的变化关系(b)

Figure 5. Raman spectra under different pressures (a) and pressure dependence of Raman frequencies (b)

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图 6 (a) 1.3～10.3 GPa、(b) 14.6～31.0 GPa、(c) 37.2～67.7 GPa压力范围内FePSe₃的电阻-温度曲线（插图显示了DAC内FePSe₃样品形貌）

Figure 6. Evolution of the electrical resistance as a function of temperature for compressed FePSe₃ at (a) 1.3–10.3 GPa, (b) 14.6–31.0 GPa, (c) 37.2–67.7 GPa (The inset shows the optical image of FePSe₃ in the DAC)

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图 7 (a) 在不高于1.0 T的磁场作用下31.8 GPa时电阻随温度的变化关系以及(b) 31.8 GPa时T_c随磁场的变化

Figure 7. (a) Temperature dependence of resistance under different magnetic fields up to 1.0 T at 31.8 GPa, and (b) T_c dependence of external magnetic field at 31.8 GPa

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图 8 FePSe₃的温度-压力相图

Figure 8. Temperature-pressure phase diagram of FePSe₃

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