Coevolution of superconductivity and Hall coefficient with anisotropic lattice shrinkage in compressed KCa2Fe4As4F2

doi:10.1088/1674-1056/ad4d65

中国物理B ›› 2024, Vol. 33 ›› Issue (7): 77402-077402.doi: 10.1088/1674-1056/ad4d65

Coevolution of superconductivity and Hall coefficient with anisotropic lattice shrinkage in compressed KCa₂Fe₄As₄F₂

Jinyu Han(韩金宇)^1,3, Wenshan Hong(洪文山)¹, Shu Cai(蔡树)², Jinyu Zhao(赵金瑜)^1,3, Jing Guo(郭静)¹, Yazhou Zhou(周亚洲)¹, Pengyu Wang(王鹏玉)^1,3, Lixin Cao(曹立新)¹, Huiqian Luo(罗会仟)^1,3, Shiliang Li(李世亮)^1,3, Qi Wu(吴奇)¹, and Liling Sun(孙力玲)^1,2,3,†

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 Center for High Pressure Science & Technology Advanced Research, Beijing 100094, China;
3 University of Chinese Academy of Sciences, Beijing 100190, China

收稿日期:2024-05-02 修回日期:2024-05-16 接受日期:2024-05-20 出版日期:2024-06-18 发布日期:2024-06-28
通讯作者: Liling Sun E-mail:llsun@iphy.ac.cn,liling.sun@hpstar.ac.cn
基金资助:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2022YFA1403900, 2021YFA1401800, 2018YFA0704201, and 2023YFA1406103), the National Natural Science Foundation of China (Grant Nos. U2032214, 12122414, 12104487, and 12004419), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB25000000).

Coevolution of superconductivity and Hall coefficient with anisotropic lattice shrinkage in compressed KCa₂Fe₄As₄F₂

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 Center for High Pressure Science & Technology Advanced Research, Beijing 100094, China;
3 University of Chinese Academy of Sciences, Beijing 100190, China

Received:2024-05-02 Revised:2024-05-16 Accepted:2024-05-20 Online:2024-06-18 Published:2024-06-28
Contact: Liling Sun E-mail:llsun@iphy.ac.cn,liling.sun@hpstar.ac.cn
Supported by:
Project supported by the National Key Research and Development Program of China (Grant Nos. 2022YFA1403900, 2021YFA1401800, 2018YFA0704201, and 2023YFA1406103), the National Natural Science Foundation of China (Grant Nos. U2032214, 12122414, 12104487, and 12004419), and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB25000000).

摘要/Abstract

摘要： The stability of superconductivity in superconductors is widely recognized to be determined by various factors, including charge, spin, orbit, lattice, and other related degrees of freedom. Here, we report our findings on the pressure-induced coevolution of superconductivity and Hall coefficient in KCa$_{2}$Fe$_{4}$As$_{4}$F$_{2}$, an iron-based superconductor possessing a hybrid crystal structure combining KFe$_{2}$As$_{2}$ and CaFeAsF. Our investigation, involving high-pressure resistance, Hall effect and x-ray diffraction (XRD) measurements, allows us to observe the connection of the superconductivity and Hall coefficient with the anisotropic lattice shrinkage. We find that its ambient-pressure tetragonal (T) phase presents a collapse starting at around 18 GPa, where the sign of the Hall coefficient ($R_{\rm H}$) changes from positive to negative. Upon further compression, both superconducting transition temperature ($T_{\rm c}$) and $R_{\rm H}$ exhibit a monotonous decrease. At around 41 GPa, the superconductivity is completely suppressed ($T_{\rm c}=0$), where the parameter $a$ begins to decline again and the Hall coefficient remains nearly unchanged. Our experiment results clearly demonstrate that the pressure-induced anisotropic lattice collapse plays a crucial role in tuning the interplay among multiple degrees of freedom in the superconducting system and, correspondingly, the stability of the superconductivity.

关键词: effects of pressure, pnictides and chalcogenides, transport properties

Abstract: The stability of superconductivity in superconductors is widely recognized to be determined by various factors, including charge, spin, orbit, lattice, and other related degrees of freedom. Here, we report our findings on the pressure-induced coevolution of superconductivity and Hall coefficient in KCa$_{2}$Fe$_{4}$As$_{4}$F$_{2}$, an iron-based superconductor possessing a hybrid crystal structure combining KFe$_{2}$As$_{2}$ and CaFeAsF. Our investigation, involving high-pressure resistance, Hall effect and x-ray diffraction (XRD) measurements, allows us to observe the connection of the superconductivity and Hall coefficient with the anisotropic lattice shrinkage. We find that its ambient-pressure tetragonal (T) phase presents a collapse starting at around 18 GPa, where the sign of the Hall coefficient ($R_{\rm H}$) changes from positive to negative. Upon further compression, both superconducting transition temperature ($T_{\rm c}$) and $R_{\rm H}$ exhibit a monotonous decrease. At around 41 GPa, the superconductivity is completely suppressed ($T_{\rm c}=0$), where the parameter $a$ begins to decline again and the Hall coefficient remains nearly unchanged. Our experiment results clearly demonstrate that the pressure-induced anisotropic lattice collapse plays a crucial role in tuning the interplay among multiple degrees of freedom in the superconducting system and, correspondingly, the stability of the superconductivity.

Key words: effects of pressure, pnictides and chalcogenides, transport properties

中图分类号: (Effects of pressure)

74.62.Fj

74.70.Xa (Pnictides and chalcogenides) 74.25.F- (Transport properties)

Jinyu Han(韩金宇), Wenshan Hong(洪文山), Shu Cai(蔡树), Jinyu Zhao(赵金瑜), Jing Guo(郭静), Yazhou Zhou(周亚洲), Pengyu Wang(王鹏玉), Lixin Cao(曹立新), Huiqian Luo(罗会仟), Shiliang Li(李世亮), Qi Wu(吴奇), and Liling Sun(孙力玲). Coevolution of superconductivity and Hall coefficient with anisotropic lattice shrinkage in compressed KCa₂Fe₄As₄F₂[J]. 中国物理B, 2024, 33(7): 77402-077402.

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Coevolution of superconductivity and Hall coefficient with anisotropic lattice shrinkage in compressed KCa₂Fe₄As₄F₂

Coevolution of superconductivity and Hall coefficient with anisotropic lattice shrinkage in compressed KCa₂Fe₄As₄F₂

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