Coevolution of superconductivity and Hall coefficient with anisotropic lattice shrinkage in compressed KCa_(2)Fe_(4)As_(24F_(2)

作     者：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 Jinyu Han;Wenshan Hong;Shu Cai;Jinyu Zhao;Jing Guo;Yazhou Zhou;Pengyu Wang;Lixin Cao;Huiqian Luo;Shiliang Li;Qi Wu;Liling Sun

作者机构：Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing 100190China Center for High Pressure Science&Technology Advanced ResearchBeijing 100094China University of Chinese Academy of SciencesBeijing 100190China 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2024年第33卷第7期

页      面：66-70页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 0702[理学-物理学] 

基　　金：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) the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant No.XDB25000000) 

主　　题：effects of pressure pnictides and chalcogenides transport properties 

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 ***,we report our findings on the pressure-induced coevolution of superconductivity and Hall coefficient in KCa_(2)Fe_(4)As_(24F_(2),an iron-based superconductor possessing a hybrid crystal structure combining KFe_(2)As_(2) and *** 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 *** find that its ambient-pressure tetragonal(T) phase presents a collapse starting at around 18 GPa,where the sign of the Hall coefficient(R_(H)) changes from positive to *** further compression,both superconducting transition temperature(T_(c)) and R_(H) exhibit a monotonous *** around 41 GPa,the superconductivity is completely suppressed(T_(c)=0),where the parameter a begins to decline again and the Hall coefficient remains nearly *** 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.