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Superconductivity in an intermetallic oxide Hf3Pt4Ge2O

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【作者】 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

【Author】 Chengchao Xu;Hong Wang;Huanfang Tian;Youguo Shi;Zi-An Li;Ruijuan Xiao;Honglong Shi;Huaixin Yang;Jianqi Li;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences;School of Physical Sciences,University of Chinese Academy of Sciences;School of Science,Minzu University;

【通讯作者】 李建奇;

【机构】 Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of SciencesSchool of Physical Sciences University of Chinese Academy of SciencesSchool of Science Minzu University

【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 Hf3Pt Ge2O synthesized through a solid-state reaction. The Hf3Pt Ge2O 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 Hf3Pt Ge2O 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 Hf3Pt Ge2O1+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.

【Abstract】 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 Hf3Pt Ge2O synthesized through a solid-state reaction. The Hf3Pt Ge2O 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 Hf3Pt Ge2O 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 Hf3Pt Ge2O1+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.

【基金】 Project supported by 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)
  • 【文献出处】 Chinese Physics B ,中国物理B , 编辑部邮箱 ,2021年07期
  • 【分类号】O511.3
  • 【下载频次】23
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