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

【摘要】 Mn-based superconductors are very rare and their superconductivity has only been reported in three-dimensional Mn P and quasi-one-dimensional KMn₆Bi₅ and Rb Mn₆Bi₅ with[Mn₆Bi₅]^-columns under high pressures.Here we report the synthesis,magnetism,electrical resistivity,and specific heat capacity of the newly discovered quasione-dimensional Na Mn₆Bi₅.Compared with other AMn₆Bi₅ （A=K,Rb,and Cs）,Na Mn₆Bi₅ 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 Na Mn₆Bi₅ is unusually large.Using first-principles calculations,an unusual enhancement of density of states near the Fermi level is demonstrated for Na Mn₆Bi₅.The features make Na Mn₆Bi₅ a more suitable platform to explore the interplay of magnetism and superconductivity.更多还原

【Abstract】 Mn-based superconductors are very rare and their superconductivity has only been reported in three-dimensional Mn P and quasi-one-dimensional KMn₆Bi₅ and Rb Mn₆Bi₅ with[Mn₆Bi₅]^-columns under high pressures.Here we report the synthesis,magnetism,electrical resistivity,and specific heat capacity of the newly discovered quasione-dimensional Na Mn₆Bi₅.Compared with other AMn₆Bi₅ （A=K,Rb,and Cs）,Na Mn₆Bi₅ 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 Na Mn₆Bi₅ is unusually large.Using first-principles calculations,an unusual enhancement of density of states near the Fermi level is demonstrated for Na Mn₆Bi₅.The features make Na Mn₆Bi₅ a more suitable platform to explore the interplay of magnetism and superconductivity.更多还原