Emergence of Superconductivity on the Border of Antiferromagnetic Order in RbMn$_{6}$Bi$_{5}$ under High Pressure: A New Family of Mn-Based Superconductors
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
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 $T_{\rm c}$.
. [J]. 中国物理快报, 2022, 39(6): 67401-.
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. Emergence of Superconductivity on the Border of Antiferromagnetic Order in RbMn$_{6}$Bi$_{5}$ under High Pressure: A New Family of Mn-Based Superconductors. Chin. Phys. Lett., 2022, 39(6): 67401-.
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2022, Vol. 39 
