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Mn-based superconductor is rare and recently reported inquasi-one-dimensional KMn$_6$Bi$_5$ with [Mn$_6$Bi$_5$]-columns under highpressure. Here we report the synthesis, magnetic properties, electricalresistivity, and specific heat capacity of the newly-discoveredquasi-one-dimensional NaMn$_6$Bi$_5$ single crystal. Compared with otherAMn$_6$Bi$_5$ (A = K, Rb, and Cs), NaMn$_6$Bi$_5$ has larger intra-column Bi-Bibond length, which may result in the two decoupled antiferromagnetictransitions at 47.3 K and 52.3 K. The relatively lower antiferromagnetictransition temperatures make NaMn$_6$Bi$_5$ a more suitable platform to exploreMn-based superconductors. Anisotropic resistivity and non-Fermi liquid behaviorat low temperature are observed. Heat capacity measurement reveals thatNaMn$_6$Bi$_5$ has similar Debye temperature with those of AMn$_6$Bi$_5$ (A = Kand Rb), whereas the Sommerfeld coefficient is unusually large. Usingfirst-principles calculations, the quite different density of states and anunusual enhancement near the Fermi level are observed for NaMn$_6$Bi$_5$, whencompared with those of other AMn$_6$Bi$_5$ (A = K, Rb, and Cs) compounds.

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