Pressure-Induced Superconductivity in the Charge-Density-Wave Compound LaTe_(2-x)Sb_(x)(x=0 and 0.4)  

作　　者：陈旭 孙培函 谢圳楷 孟繁琦 裴翠颖 齐彦鹏 应天平 刘凯 郭建刚 陈小龙 Xu Chen;Pei-han Sun;Zhenkai Xie;Fanqi Meng;Cuiying Pei;Yanpeng Qi;Tianping Ying;Kai Liu;Jian-gang Guo;Xiaolong Chen(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices,Renmin University of China,Beijing 100872,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China;Shanghai Key Laboratory of High-resolution Electron Microscopy and ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials&Micro-nano Devices,Renmin University of China,Beijing 100872,China [3]University of Chinese Academy of Sciences,Beijing 100049,China [4]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [5]ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China [6]Shanghai Key Laboratory of High-resolution Electron Microscopy and ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China

出　　处：《Chinese Physics Letters》2023年第10期101-107,共7页中国物理快报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(Grant Nos.2018YFE0202600,2021YFA1401800,2017YFA0304700);the National Natural Science Foundation of China(Grant Nos.51922105,11804184,11974208,11774424,12174443,U1932217,and11974246);Beijing Natural Science Foundation(Grant No.Z200005);supported by the Synergetic Extreme Condition User Facility(SECUF)。

摘　　要：Magnetic CeTe_(2)achieving superconductivity under external pressure has received considerable attention.The intermingling of 4f and 5d electrons from Ce raised the speculation of an unconventional pairing mechanism arising from magnetic fluctuations.Here,we address this speculation using a nonmagnetic 4f-electron-free LaTe_(2)as an example.No structural phase transition can be observed up to 35 GPa in the in situ synchrotron diffraction patterns.Subsequent high-pressure electrical measurements show that LaTe_(2)exhibits superconductivity at20 Gpa with its T_(c)(4.5 K)being two times higher than its Ce-counterpart.Detailed theoretical calculations reveal that charge transfer from the 4p orbitals of the planar square Te-Te network to the 5d orbitals of La is responsible for the emergence of superconductivity in LaTe_(2),as confirmed by Hall experiments.Furthermore,we study the modulation of q_(CDW)by Sb substitution and find a record high T_(c)^(onset)~6.5 K in LaTe_(1.6)Sb_(0.4).Our work provides an informative clue to comprehend the role of 5d-4p hybridization in the relationship between charge density wave(CDW)and superconductivity in these RETe_(2)(RE=rare-earth elements)compounds.

关 键 词：SUPERCONDUCTIVITY CHARGE RARE 

分 类 号：TG1[金属学及工艺—金属学]