Superconductivity in an intermetallic oxide Hf3Pt4Ge2O

• 作者: Chengchao Xu Hong Wang Huanfang Tian Youguo Shi Zi-An Li Ruijuan Xiao Honglong Shi Huaixin Yang Jianqi Li
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2021,（7）
• 所属期刊栏目: CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC,AND OPTICAL PROPERTIES
• 页码范围: 578-586
• 页数: 9页
• 语种: 英文
• DOI: 10.1088/1674-1056/abfb53

摘要

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 mecha-nisms.Here,we report the discovery of superconductivity in a new intermetallic oxide Hf3Pt4Ge2O synthesized through a solid-state reaction.The Hf3Pt4Ge2O crystallizes in a cubic structure (space group Fm-3m) 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 resistiv-ity,magnetic susceptibility,and specific heat measurements.The intermetallic oxide Hf3Pt4Ge2O system demonstrates an intriguing structural feature that foreign oxygen atoms can be accommodated in the interstitial sites of the ternary in-termetallic framework.We also successfully synthesized a series of Hf3Pt4Ge2Ol+δ (-0.25 ≤ δ ≤ 0.5),and found the δ-dependent superconducting transition temperature Tc.The atomic structure and the electronic structure are also substan-tiated 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 5d-electron in these intermetallic compound systems.