Well defined phase boundaries and superconductivity with high T_(c)in PbSe single crystal  

作　　者：Jiawei Hu Yanghao Meng He Zhang Wei Zhong Hang Zhai Xiaohui Yu Binbin Yue Fang Hong 胡佳玮;孟养浩;张赫;钟韦;翟航;于晓辉;岳彬彬;洪芳

机构地区：[1]Key Laboratory of Materials Physics,Institute of Solid State Physics,HFIPS,Chinese Academy of Sciences,Hefei 230031,China [2]University of Science and Technology of China,Hefei 230026,China [3]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [4]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 10019,China [5]Center for High Pressure Science and Technology Advanced Research,Beijing 100094,China [6]State Key Laboratory of Superhard Materials,International Center for Computational Method and Software,and Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy Materials,Jilin University,Changchun 130012,China [7]Songshan Lake Materials Laboratory,Dongguan 523808,China

出　　处：《Chinese Physics B》2025年第4期78-84,共7页中国物理B(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12374050,12004014,U1930401,and 12375304);the National Key R&D Program of China(Grant Nos.2021YFA1400300 and 2023YFA1608900);the Major Program of the National Natural Science Foundation of China(Grant No.22090041).

摘　　要：Lead chalcogenides represent a significant class of materials that exhibit intriguing physical phenomena,including remarkable thermoelectric properties and superconductivity.In this study,we present a comprehensive investigation on the superconductivity of PbSe single crystal under high pressure.The signature of superconducting(SC)transition starts to appear at 7.2 K under 16.5 GPa.Upon further compression,the SC temperature(T_(c))decreases,and it is reduced to 3.5 K at 45.0 GPa.The negative pressure dependent behavior of T_(c)is consistent with the trend of T_(c)-P relations observed in other lead chalcogenides.The highest T_(c)is 8.0 K observed at 20.5 GPa during decompression process,which is also the highest record among all other PbSe derivatives,such as doped samples,superlattices,and so on.The phase boundaries of the structural and electronic transitions are well defined by Raman spectroscopy,and then phase diagrams are plotted for both compression and decompression processes.This work corrects the previous claim of positive pressure dependence of T_(c)in PbSe and provides clear phase diagrams for intrinsic superconductivity in PbSe under pressure.

关 键 词：SUPERCONDUCTIVITY high-pressure electrical transport Raman spectroscopy phase diagrams 

分 类 号：O469[理学—凝聚态物理]