Chin. Phys. Lett.  2022, Vol. 39 Issue (6): 067401    DOI: 10.1088/0256-307X/39/6/067401
Emergence of Superconductivity on the Border of Antiferromagnetic Order in RbMn$_{6}$Bi$_{5}$ under High Pressure: A New Family of Mn-Based Superconductors
Peng-Tao Yang1,2†, Qing-Xin Dong1,2†, Peng-Fei Shan1,2†, Zi-Yi Liu1,2†, Jian-Ping Sun1,2, Zhi-Ling Dun1,2, Yoshiya Uwatoko3, Gen-Fu Chen1,2*, Bo-Sen Wang1,2*, and Jin-Guang Cheng1,2*
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100190, China
3Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Peng-Tao Yang, Qing-Xin Dong, Peng-Fei Shan et al  2022 Chin. Phys. Lett. 39 067401
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Abstract 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 $T_{\rm N} = 83$ K at ambient pressure is first enhanced moderately and then suppressed completely at a critical pressure of $P_{\rm c} \approx 13$ GPa, around which bulk superconductivity emerges and exhibits a dome-like $T_{\rm c}(P)$ with a maximal $T_{\rm c}^{\rm onset} \approx 9.5$ K at about 15 GPa. In addition, the superconducting state around $P_{\rm c}$ is characterized by a large upper critical field $\mu_{0}H_{\rm c2}(0)$ 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 $T_{\rm c}^{\rm onset} \approx 9.3$ K), makes $A$Mn$_{6}$Bi$_{5}$ ($A$ = alkali metal) a new family of Mn-based superconductors with relatively high $T_{\rm c}$.
Received: 28 March 2022      Editors' Suggestion Published: 05 May 2022
PACS:  74.70.Dd (Ternary, quaternary, and multinary compounds)  
  74.62.Fj (Effects of pressure)  
  74.40.Kb (Quantum critical phenomena)  
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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
and Jin-Guang Cheng
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