A new quasi-one-dimensional superconductor parent compound NaMn${}_6$Bi${}_5$ with lower antiferromagnetic transition temperatures

Abstract

Mn-based superconductor is rare and recently reported in quasi-one-dimensional KMn${}_6$Bi${}_5$ with [Mn${}_6$Bi${}_5$]-columns under high pressure. Here we report the synthesis, magnetic properties, electrical resistivity, and specific heat capacity of the newly-discovered quasi-one-dimensional NaMn${}_6$Bi${}_5$ single crystal. Compared with other AMn${}_6$Bi${}_5$ (A = K, Rb, and Cs), NaMn${}_6$Bi${}_5$ has larger intra-column Bi-Bi bond length, which may result in the two decoupled antiferromagnetic transitions at 47.3 K and 52.3 K. The relatively lower antiferromagnetic transition temperatures make NaMn${}_6$Bi${}_5$ a more suitable platform to explore Mn-based superconductors. Anisotropic resistivity and non-Fermi liquid behavior at low temperature are observed. Heat capacity measurement reveals that NaMn${}_6$Bi${}_5$ has similar Debye temperature with those of AMn${}_6$Bi${}_5$ (A = K and Rb), whereas the Sommerfeld coefficient is unusually large. Using first-principles calculations, the quite different density of states and an unusual enhancement near the Fermi level are observed for NaMn${}_6$Bi${}_5$, when compared with those of other AMn${}_6$Bi${}_5$ (A = K, Rb, and Cs) compounds.

arXiv comment19 pages,9 figures,2 tables

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• Emergence of superconductivity on the border of antiferromagnetic order in RbMn6Bi5 under high pressure: A new family of Mn-based superconductors
• Flipping of antiferromagnetic to superconducting states in pressurized quasi-one-dimensional manganese-based compounds
• Spin and charge density waves in the quasi-one-dimensional KMn6Bi5
• Structure, physical properties, and magnetically tunable topological phases in topological semimetal EuCuBi
• Unusual antiferromagnetic order and fluctuations in RbMn${}_6$Bi${}_5$