Superconductivity of Lanthanum Superhydride Investigated Using the Standard Four-Probe Configuration under High Pressures  

作　　者：Fang Hong Liuxiang Yang Pengfei Shan Pengtao Yang Ziyi Liu Jianping Sun Yunyu Yin Xiaohui Yu Jinguang Cheng Zhongxian Zhao 洪芳;杨留响;单鹏飞;杨芃焘;刘子儀;孙建平;殷云宇;于晓辉;程金光;赵忠贤(Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Center for High Pressure Science&Technology Advanced Research,Beijing 100094,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]Center for High Pressure Science&Technology Advanced Research,Beijing 100094,China [3]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Chinese Physics Letters》2020年第10期83-86,共4页中国物理快报（英文版）

基　　金：Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant Nos.XDB33000000 and XDB25000000);the Beijing Natural Science Foundation(Grant No.Z190008);the National Natural Science Foundation of China(Grant Nos.11575288, 11921004, 11888101, 11904391, 11834016 and 11874400);the National Key R&D Program of China(Grant Nos.2016YFA0401503 and 2018YFA0305700);the Youth Innovation Promotion Association,the Key Research Program of Frontier Sciences and the Interdisciplinary Innovation Team of Chinese Academy of Sciences(Grant Nos.2016006, JCTD-2019-01,and QYZDBSSW-SLH013)

摘　　要：Recently,the theoretically predicted lanthanum superhydride,LaH 10±δ,with a clathrate-like structure was successfully synthesized and found to exhibit a record high superconducting transition temperature T c≈250 K at∼170 GPa,opening a new route for room-temperature superconductivity.However,since in situ experiments at megabar pressures are very challenging,few groups have reported the∼250 K superconducting transition in LaH 10±δ.Here,we establish a simpler sample-loading procedure that allows a relatively large sample size for synthesis and a standard four-probe configuration for resistance measurements.Following this procedure,we successfully synthesized LaH 10±δwith dimensions up to 10×20μm^2 by laser heating a thin La flake and ammonia borane at∼1700 K in a symmetric diamond anvil cell under the pressure of 165 GPa.The superconducting transition at T c≈250 K was confirmed through resistance measurements under various magnetic fields.Our method will facilitate explorations of near-room-temperature superconductors among metal superhydrides.

关 键 词：resistance HYDRIDE PROBE 

分 类 号：O614.331[理学—无机化学]