We report superconductivity in a new ternary molybdenum pnictide Rb2 Mo3 As3,synthesized via the solid state reaction method.Powder x-ray diffraction analysis reveals a hexagonal crystal structure with space group P6 ...We report superconductivity in a new ternary molybdenum pnictide Rb2 Mo3 As3,synthesized via the solid state reaction method.Powder x-ray diffraction analysis reveals a hexagonal crystal structure with space group P6 m2(No.187),and the refined lattice parameters are a=10.431(5)A,c=4.460(4)A.SEM images show rod-like grains with good ductility,confirming a quasi-one-dimensional(Q1 D)structure.Electrical resistivity and dc magnetic susceptibility characterizations exhibit superconductivity with an onset of Tc=10.5 K.The upper critical field of Rb2 Mo3 As3 is estimated to be 28.2 T at zero temperature,providing an evidence of possible unconventional superconductivity.Our recent discovery of MoAs-based superconductors above 10 K provides a unique platform for the study of exotic superconductivity in 4 d electron systems with Q1 D crystal structures.展开更多
基金Supported by the National Key Research and Development of China(Grant Nos.2018YFA0704200 and 2016YFA0300301)the National Natural Science Foundation of China(Grant No.11774402)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB25000000)。
文摘We report superconductivity in a new ternary molybdenum pnictide Rb2 Mo3 As3,synthesized via the solid state reaction method.Powder x-ray diffraction analysis reveals a hexagonal crystal structure with space group P6 m2(No.187),and the refined lattice parameters are a=10.431(5)A,c=4.460(4)A.SEM images show rod-like grains with good ductility,confirming a quasi-one-dimensional(Q1 D)structure.Electrical resistivity and dc magnetic susceptibility characterizations exhibit superconductivity with an onset of Tc=10.5 K.The upper critical field of Rb2 Mo3 As3 is estimated to be 28.2 T at zero temperature,providing an evidence of possible unconventional superconductivity.Our recent discovery of MoAs-based superconductors above 10 K provides a unique platform for the study of exotic superconductivity in 4 d electron systems with Q1 D crystal structures.
