We report the synthesis,structural and physical properties of a new layered transition metal arsenide Na4Cu3TaAs4.This material adopts the space groupⅠ√2 m,with lattice parameters of a=5.9101(3)?and c=13.8867(12)?.T...We report the synthesis,structural and physical properties of a new layered transition metal arsenide Na4Cu3TaAs4.This material adopts the space groupⅠ√2 m,with lattice parameters of a=5.9101(3)?and c=13.8867(12)?.This structure contains two layers of Na sandwiched by antiPb O-type(Cu/Ta)As layers,similar to the"111"-type ironbased superconductor Na Fe As.The transition metal sites are occupied by 75%Cu and 25%Ta,with Ta forming a well-defined superstructure.Cu and Ta were determined to be+1 and+5 oxidation state respectively.The band structure of the Na4Cu3TaAs4 measured by angle resolved photoemission spectroscopy(ARPES)is in good agreement with the density functional theory(DFT)calculation.Both ARPES and resistivity measurement indicate that this material exhibits metallic behavior with p-type carriers.Magnetic susceptibility measurement shows that the material exhibits nearly T-independent diamagnetism.This new material extends the material system with anti-Pb O-type layers and offers a good playground to investigate this material system further.展开更多
基金supported by the National Natural Science Foundation of China(11888101 and 11534010)Anhui Initiative in Quantum Information Technologies(AHY160000)+2 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(XDB25000000)the National Key Research and Development Program of the Ministry of Science and Technology of China(2016YFA0300201 and 2017YFA0303001)the Key Research Program of Frontier Sciences,CAS,China(QYZDYSSW-SLH021).
文摘We report the synthesis,structural and physical properties of a new layered transition metal arsenide Na4Cu3TaAs4.This material adopts the space groupⅠ√2 m,with lattice parameters of a=5.9101(3)?and c=13.8867(12)?.This structure contains two layers of Na sandwiched by antiPb O-type(Cu/Ta)As layers,similar to the"111"-type ironbased superconductor Na Fe As.The transition metal sites are occupied by 75%Cu and 25%Ta,with Ta forming a well-defined superstructure.Cu and Ta were determined to be+1 and+5 oxidation state respectively.The band structure of the Na4Cu3TaAs4 measured by angle resolved photoemission spectroscopy(ARPES)is in good agreement with the density functional theory(DFT)calculation.Both ARPES and resistivity measurement indicate that this material exhibits metallic behavior with p-type carriers.Magnetic susceptibility measurement shows that the material exhibits nearly T-independent diamagnetism.This new material extends the material system with anti-Pb O-type layers and offers a good playground to investigate this material system further.
