Discovery of a new superconductor with distinct crystal structure and chemistry often provides great opportunity for further expanding superconductor material base,and also leads to better understanding of superconduc...Discovery of a new superconductor with distinct crystal structure and chemistry often provides great opportunity for further expanding superconductor material base,and also leads to better understanding of superconductivity mechanisms.Here,we report the discovery of superconductivity in a new intermetallic oxide Hf_(3)Pt_Ge_(2)O synthesized through a solid-state reaction.The Hf_(3)Pt_Ge_(2)O crystallizes in a cubic structure(space group Fm-3 m)with a lattice constant of a=1.241 nm,whose stoichiometry and atomic structure are determined by electron microscopy and x-ray diffraction techniques.The superconductivity at 4.1 K and type-II superconducting nature are evidenced by the electrical resistivity,magnetic susceptibility,and specific heat measurements.The intermetallic oxide Hf_(3)Pt_Ge_(2)O system demonstrates an intriguing structural feature that foreign oxygen atoms can be accommodated in the interstitial sites of the ternary intermetallic framework.We also successfully synthesized a series of Hf_(3)Pt_Ge_(2)O1+δ(-0.25≤δ≤0.5),and found theδ-dependent superconducting transition temperature Tc.The atomic structure and the electronic structure are also substantiated by first-principles calculations.Our results present an entirely new family of superconductors with distinct structural and chemical characteristics,and could attract research interest in further finding new superconductors and exploring novel physics pertaining to the 5 d-electron in these intermetallic compound systems.展开更多
基金the National Key Research and Development Program of China(Grant Nos.2016YFA0300303,2017YFA0504703,2017YFA03029042017YFA0303000)+4 种基金the National Basic Research Program of China(Grant No.2015CB921304)the National Natural Science Foundation of China(Grant Nos.11774391,11774403,and 11804381)the Strategic Priority Research Program(B)of the Chinese Academy of Sciences(Grant Nos.XDB25000000and XDB07020000)the Scientific Instrument Developing Project of the Chinese Academy of Sciences(Grant No.ZDKYYQ20170002)the China Postdoctoral Science Foundation(Grant No.BX20180351)。
文摘Discovery of a new superconductor with distinct crystal structure and chemistry often provides great opportunity for further expanding superconductor material base,and also leads to better understanding of superconductivity mechanisms.Here,we report the discovery of superconductivity in a new intermetallic oxide Hf_(3)Pt_Ge_(2)O synthesized through a solid-state reaction.The Hf_(3)Pt_Ge_(2)O crystallizes in a cubic structure(space group Fm-3 m)with a lattice constant of a=1.241 nm,whose stoichiometry and atomic structure are determined by electron microscopy and x-ray diffraction techniques.The superconductivity at 4.1 K and type-II superconducting nature are evidenced by the electrical resistivity,magnetic susceptibility,and specific heat measurements.The intermetallic oxide Hf_(3)Pt_Ge_(2)O system demonstrates an intriguing structural feature that foreign oxygen atoms can be accommodated in the interstitial sites of the ternary intermetallic framework.We also successfully synthesized a series of Hf_(3)Pt_Ge_(2)O1+δ(-0.25≤δ≤0.5),and found theδ-dependent superconducting transition temperature Tc.The atomic structure and the electronic structure are also substantiated by first-principles calculations.Our results present an entirely new family of superconductors with distinct structural and chemical characteristics,and could attract research interest in further finding new superconductors and exploring novel physics pertaining to the 5 d-electron in these intermetallic compound systems.
