摘要
We report a comprehensive high-pressure study on the monoclinic TIFeSe2 single crystal,which is an antiferromagnetic jnsulator with quasi-one-dimensional crystal structure at ambient pressure.It is found that TIFeSe2 undergoes a pressure-induced structural transformation from the monoclinic phase to an orthorhombic structure above Pc≈13 GPa,accompanied with a large volume collapse of ΔV/V0=8.3%.In the low-pressure monoclinic phase,the insulating state is easily metallized at pressures above 2 GPa;while possible superconductivity with Tconset^2 K is found to emerge above 30 GPa in the high-pressure phase.Such a great tunability of TIFeSe2 under pressure indicates that the ternary AFeSe2 system(A=Tl,K,Cs,Rb) should be taken as an important platform for explorations of interesting phenomena such as insulator-metal transition,dimensionality crossover,and superconductivity.
作者
Zi-Yi Liu
Qing-Xin Dong
Peng-Fei Shan
Yi-Yan Wang
Jian-Hong Dai
Rajesh Jana
Ke-Yu Chen
Jian-Ping Sun
Bo-Sen Wang
Xiao-Hui Yu
Guang-Tong Liu
Yoshiya Uwatoko
Yu Sui
Huai-Xin Yang
Gen-Fu Chen
Jin-Guang Cheng
刘子儀;董庆新;单鹏飞;王义炎;戴建洪;Rajesh Jana;陈科宇;孙建平;王铂森;于晓辉;刘广同;Yoshiya Uwatoko;隋郁;杨槐馨;陈根富;程金光(Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190;School of Physics,Harbin Institute of Technology,Harbin 150001;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190;Songshan Lake Materials Laboratory,Dongguan 523808;Institute for Solid State Physics,University of Tokyo,Kashiwa,Chiba 277-8581,Japan)
基金
Supported by the National Key R&D Program of China(2018YFA0305700)
the National Natural Science Foundation of China(11904391,11834016,11874400,11888101,11921004)
the Beijing Natural Science Foundation(Z190008)
the Strategic Priority Research Program and the Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(XDB25000000,QYZDB-SSW-SLH013)
the CAS Interdisciplinary Innovation Team(JCTD-2019-01)
JPS acknowledges the support from the China Postdoctoral Science Foundation and the Postdoctoral Innovative Talent Program.
