A New Superconductor Parent Compound NaMn6Bi5 with Quasi-One-Dimensional Structure and Lower Antiferromagnetic-Like Transition Temperatures

• Published in: Chinese physics letters Vol. 39; no. 4; pp. 62 - 71
• Main Authors: Zhou, Ying, Chen, Long, Wang, Gang, Wang, Yu-Xin, Wang, Zhi-Chuan, Chai, Cong-Cong, Guo, Zhong-Nan, Hu, Jiang-Ping, Chen, Xiao-Long
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.04.2022; Songshan Lake Materials Laboratory,Dongguan 523808,China%Department of Chemistry,School of Chemistry and Biological Engineering,University of Science and Technology Beijing,Beijing 100083,China; Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China; University of Chinese Academy of Sciences,Beijing 100049,China%Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China; University of Chinese Academy of Sciences,Beijing 100049,China
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/39/4/047401

Mn-based superconductors are very rare and their superconductivity has only been reported in three-dimensional MnP and quasi-one-dimensional KMn6Bi5 and RbMn6Bi5 with[Mn6Bi5]-columns under high pressures.Here we report the synthesis,magnetism,electrical resistivity,and specific heat capacity of the newly discovered quasi-one-dimensional NaMn6Bi5.Compared with other AMn6Bi5(A=K,Rb,and Cs),NaMn6Bi5 has abnormal Bi-Bi bond lengths and two antiferromagnetic-like transitions at 47.3 K and 51.8 K.Anisotropic resistivity and low-temperature non-Fermi liquid behavior are observed.Heat capacity measurement reveals that the Sommerfeld coefficient for NaMn6Bi5 is unusually large.Using first-principles calculations,an unusual enhancement of density of states near the Fermi level is demonstrated for NaMn6Bi5.The features make NaMn6Bi5 a more suitable platform to explore the interplay of magnetism and superconductivity.