Superconductivity in an intermetallic oxide Hf_(3)Pt_(4)Ge_(2)O  

作　　者：Chengchao Xu Hong Wang Huanfang Tian Youguo Shi Zi-An Li Ruijuan Xiao Honglong Shi Huaixin Yang Jianqi Li 徐程超;王鸿;田焕芳;石友国;李子安;肖睿娟;施洪龙;杨槐馨;李建奇(Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;School of Science,Minzu University,Beijing 100081,China)

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Science,Minzu University,Beijing 100081,China

出　　处：《Chinese Physics B》2021年第7期507-514,共8页中国物理B（英文版）

基　　金：the National Key Research and Development Program of China(Grant Nos.2016YFA0300303,2017YFA0504703,2017YFA0302904;2017YFA0303000);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)。

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 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.

关 键 词：SUPERCONDUCTIVITY intermetallic oxide 5d-electron 

分 类 号：O511.3[一般工业技术—材料科学与工程]