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Decompression-Driven Superconductivity Enhancement in In2Se3 TEXT SIZE: A A A

An unexpected superconductivity enhancement is reported in decompressed In2Se3. The onset of superconductivity in In2Se3 occurs at 41.3 GPa with a critical temperature (T-c) of 3.7 K, peaking at 47.1 GPa. The striking observation shows that this layered chalcogenide remains superconducting in decompression down to 10.7 GPa. More surprisingly, the highest T-c that occurs at lower decompression pressures is 8.2 K, a twofold increase in the same crystal structure as in compression. It is found that the evolution of T-c is driven by the pressure-induced R-3m to I-43d structural transition and significant softening of phonons and gentle variation of carrier concentration combined in the pressure quench. The novel decompression-induced superconductivity enhancement implies that it is possible to maintain pressure-induced superconductivity at lower or even ambient pressures with better superconducting performance.

Publication name

 ADVANCED MATERIALS, 29 (34):10.1002/adma.201701983 SEP 13 2017

Author(s)

 Ke, Feng; Dong, Haini; Chen, Yabin; Zhang, Jianbo; Liu, Cailong; Zhang, Junkai; Gan, Yuan; Han, Yonghao; Chen, Zhiqiang; Gao, Chunxiao; Wen, Jinsheng; Yang, Wenge; Chen, Xiao-Jia; Struzhkin, Viktor V.; Mao,Ho-Kwang; Chen, Bin

Corresponding author(s) 

 CHEN Bin
 Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China. 
 GAO Chunxiao
 Jilin Univ, Inst Atom & Mol Phys, State Key Lab Superhard Mat, Changchun 130012, Jilin, Peoples R China.email

Author(s) from IGCAS   DONG Haini

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