首页|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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The stability of superconductivity in superconductors is widely recognized to be determined by various factors,includ-ing 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 KCa2Fe4As4F2,an iron-based superconductor possessing a hybrid crystal structure combining KFe2As2 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(RH)changes from positive to negative.Upon further compression,both superconducting transition temperature(Tc)and RH exhibit a monotonous decrease.At around 41 GPa,the supercon-ductivity is completely suppressed(Tc=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.

effects of pressurepnictides and chalcogenidestransport properties

韩金宇、洪文山、蔡树、赵金瑜、郭静、周亚洲、王鹏玉、曹立新、罗会仟、李世亮、吴奇、孙力玲

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Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

University of Chinese Academy of Sciences,Beijing 100190,China

Center for High Pressure Science & Technology Advanced Research,Beijing 100094,China

National Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaStrategic Priority Research Program(B)of the Chinese Academy of Sciences

2022YFA14039002021YFA14018002018YFA07042012023YFA1406103U2032214121224141210448712004419XDB25000000

2024

10.1088/1674-1056/ad4d65

中国物理B(英文版)
中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI
影响因子：0.995
ISSN：1674-1056
年,卷(期)：2024.33(7)
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