六方亚稳相ReO3的高压合成和调控

王宁宁 单鹏飞 崔琦 王罡 程金光

王宁宁, 单鹏飞, 崔琦, 王罡, 程金光. 六方亚稳相ReO3的高压合成和调控[J]. 高压物理学报, 2024, 38(5): 050105. doi: 10.11858/gywlxb.20240843
引用本文: 王宁宁, 单鹏飞, 崔琦, 王罡, 程金光. 六方亚稳相ReO3的高压合成和调控[J]. 高压物理学报, 2024, 38(5): 050105. doi: 10.11858/gywlxb.20240843
WANG Ningning, SHAN Pengfei, CUI Qi, WANG Gang, CHENG Jinguang. Synthesis and High-Pressure Regulation of Hexagonal ReO3[J]. Chinese Journal of High Pressure Physics, 2024, 38(5): 050105. doi: 10.11858/gywlxb.20240843
Citation: WANG Ningning, SHAN Pengfei, CUI Qi, WANG Gang, CHENG Jinguang. Synthesis and High-Pressure Regulation of Hexagonal ReO3[J]. Chinese Journal of High Pressure Physics, 2024, 38(5): 050105. doi: 10.11858/gywlxb.20240843

六方亚稳相ReO3的高压合成和调控

doi: 10.11858/gywlxb.20240843
基金项目: 国家重点研发计划(2023YFA1406100,2021YFA1400200);国家自然科学基金(12025408,11921004,U23A6003);国家资助博士后研究人员计划(GZB20230828);中国博士后科学基金(2023M743740)
详细信息
    作者简介:

    王宁宁(1993-),男,博士研究生,主要从事新型量子材料的合成和奇异物理现象研究. E-mail:nnwang@iphy.ac.cn

    通讯作者:

    程金光(1982-),男,博士,研究员,主要从事高压极端条件下的新材料和奇异物理现象研究. E-mail: jgcheng@iphy.ac.cn

  • 中图分类号: O521.2

Synthesis and High-Pressure Regulation of Hexagonal ReO3

  • 摘要: ReO3具有A位缺失的立方钙钛矿结构,在压力下会经历系列结构相变。近期,通过高压低温电阻测试,发现其高压R-Ⅰ相(空间群为R$ \overline{3} $c)具有高达 17 K的超导转变温度。为探索新型Re氧化物超导体,采用ReO3为前驱体,在10 GPa和600 ℃的高压高温条件下制备了具有六方对称性(空间群为P6322)的亚稳相,并在常压下对其晶体结构、磁性和电输运性质进行了表征。实验发现,六方亚稳相的电阻在常压下250 K附近出现明显异常,温度低至2 K时仍未出现超导现象。高压电阻测试表明:常压下250 K附近ReO3的电阻异常迅速消失,亚稳相表现出典型的金属行为;在62 GPa的高压条件下,温度低至1.5 K时仍未出现超导电性。

     

  • 图  ReO3在高温高压处理前后的粉末XRD谱对比

    Figure  1.  Comparison of powder XRD patterns of ReO3 before and after high-pressure and high-temperature (HPHT) treatment

    图  (a) 高温高压处理后ReO3粉末的XRD谱和Rietveld精修结果,(b) ReO3高压相的晶体结构和 (c) 氧原子晶格结构

    Figure  2.  (a) Powder XRD pattern and Rietveld refinement results of ReO3 after HPHT treatment;(b) crystal structure for the P6322 phase of ReO3 and (c) the structure of oxygen atoms

    图  P6322相ReO3的磁性特征:(a) 在0.1 T外加磁场下,2~300 K温区的零场冷(zero-field-cooling, ZFC)和场冷(field cooling, FC)变温磁化率曲线χ(T)和磁化率倒数曲线χ−1(T)(粉色实线CW fitting为居里-外斯拟合曲线);(b)不同温度下,−7 ~7 T磁场范围内的磁化曲线

    Figure  3.  Characterization of magnetic property for the P6322 phase of ReO3: (a) temperature dependence of magnetic susceptibility χ(T) and its inverse χ−1(T), measured in the zero-field-cooling (ZFC) and field cooling (FC) modes under external field of 0.1 T at 2−300 K (The Curie-Weiss (CW) fitting curve is shown by the pink solid lines.);(b) isothermal magnetization M(H) curves measured between −7−7 T at various temperatures

    图  P6322相在常压下的变温电阻率曲线

    Figure  4.  Temperature dependence of resistivity for the P6322 phase at ambient pressure

    图  P6322相在高压下的电阻曲线

    Figure  5.  Temperature dependence of the resistance for the P6322 phase of ReO3 under high pressures

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出版历程
  • 收稿日期:  2024-07-03
  • 修回日期:  2024-07-12
  • 录用日期:  2024-07-25
  • 刊出日期:  2024-09-29

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