We report the discovery of superconductivity on the border of antiferromagnetic order in a quasi-one-dimensional material RbMn6Bi5 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 TN=83 K at ambient pressure is first enhanced moderately and then suppressed completely at a critical pressure of Pc ≈ 13 GPa,around which bulk superconductivity emerges and exhibits a dome-like Tc(P)with a maximal Tconset ≈ 9.5 K at about 15 GPa.In addition,the superconducting state around Pc is characterized by a large upper critical field μ0Hc2(0)exceeding the Pauli paramagnetic limit,implying a possible unconventional paring mechanism.The present study,together with our recent work on KMn6Bi5(the maximum Tconset ≈ 9.3 K),makes AMn6Bi5(A=alkali metal)a new family of Mn-based superconductors with relatively high Tc.

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

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

中国物理快报（英文版）

[1]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-.Emergence of Superconductivity on the Border of Antiferromagnetic Order in RbMn6Bi5 under High Pressure:A New Family of Mn-Based Superconductors)[J].中国物理快报（英文版）,2022(06):25-31

Antiferromagnetic,RbMn6Bi5,Superconductors,Tconset,0Hc2,KMn6Bi5,AMn6Bi5

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