Emergence of Superconductivity on the Border of Antiferromagnetic Order in RbMn6Bi5 under High Pressure:A New Family of Mn-Based Superconductors  

作　　者：Peng-Tao Yang Qing-Xin Dong Peng-Fei Shan Zi-Yi Liu Jian-Ping Sun Zhi-Ling Dun Yoshiya Uwatoko Gen-Fu Chen Bo-Sen Wang Jin-Guang Cheng 杨芃焘;董庆新;单鹏飞;刘子儀;孙建平;顿志凌;Yoshiya Uwatoko;陈根富;王铂森;程金光(Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;Institute for Solid State Physics,University of Tokyo,Kashiwa,Chiba 277-8581,Japan)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [3]Institute for Solid State Physics,University of Tokyo,Kashiwa,Chiba 277-8581,Japan

出　　处：《Chinese Physics Letters》2022年第6期58-64,共7页中国物理快报（英文版）

基　　金：supported by the Beijing Natural Science Foundation (Grant No. Z190008);the National Key R&D Program of China (Grant Nos. 2018YFA0305700 and 2021YFA1400200);the National Natural Science Foundation of China (Grant Nos. 12025408, 11874400, 11834016, 11921004, 11904391, 12174424, and 11888101);the Strategic Priority Research Program and Key Research Program of Frontier Sciences of CAS (Grant Nos. XDB25000000, XDB33000000 and QYZDB-SSW-SLH013);the CAS Interdisciplinary Innovation Team (Grant No. JCTD-201-01);K.C.Wong Education Foundation (GJTD-2020-01);the Users with Excellence Program of Hefei Science Center CAS (Grant No. 2021HSC-UE008);Youth Promotion Association of CAS (Grant No. 2018010);support from JSPS KAKENHI (Grant No. JP19H00648)

摘　　要：We report the discovery of superconductivity on the border of antiferromagnetic order in a quasi-one-dimensional material RbMn_(6)Bi_(5)via measurements of resistivity and magnetic susceptibility under high pressures.Its phase diagram of temperature versus pressure resembles those of many magnetism-mediated superconducting systems.With increasing pressure,its antiferromagnetic ordering transition with T_(N)=83K at ambient pressure is first enhanced moderately and then suppressed completely at a critical pressure of P_(c)≈13GPa,around which bulk superconductivity emerges and exhibits a dome-like T_(c)(P)with a maximal T_(c)^(onset)≈9.5K at about 15GPa.In addition,the superconducting state around P_(c) is characterized by a large upper critical fieldμ_(0)H_(c2)(0)exceeding the Pauli paramagnetic limit,implying a possible unconventional paring mechanism.The present study,together with our recent work on KMn_(6)Bi_(5)(the maximum T_(c)^(onset)≈9.3 K),makes AMn_(6)Bi_(5)(A=alkali metal)a new family of Mn-based superconductors with relatively high T_(c).

关 键 词：critical FERROMAGNETIC EXCEEDING 

分 类 号：O469[理学—凝聚态物理] TB34[理学—电子物理学]