Pressure-induced reemergence of superconductivity in BaIr2Ge7 and Ba3Ir4Ge16 with cage structures

Pei Cuiying; Ying Tianping; Zhao Yi; Gao Lingling; Cao Weizheng; Li Changhua; Hosono Hideo; Qi Yanpeng

doi:10.1063/5.0088235

Volume 7 Issue 3

May 2022

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Pei Cuiying, Ying Tianping, Zhao Yi, Gao Lingling, Cao Weizheng, Li Changhua, Hosono Hideo, Qi Yanpeng. Pressure-induced reemergence of superconductivity in BaIr2Ge7 and Ba3Ir4Ge16 with cage structures[J]. Matter and Radiation at Extremes, 2022, 7(3): 038404. doi: 10.1063/5.0088235

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Pei Cuiying, Ying Tianping, Zhao Yi, Gao Lingling, Cao Weizheng, Li Changhua, Hosono Hideo, Qi Yanpeng. Pressure-induced reemergence of superconductivity in BaIr₂Ge₇ and Ba₃Ir₄Ge₁₆ with cage structures[J]. Matter and Radiation at Extremes, 2022, 7(3): 038404. doi: 10.1063/5.0088235

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Pressure-induced reemergence of superconductivity in BaIr₂Ge₇ and Ba₃Ir₄Ge₁₆ with cage structures

doi: 10.1063/5.0088235

1.
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
2.
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
3.
Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama 226-8503, Japan
4.
ShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China
5.
Shanghai Key Laboratory of High-Resolution Electron Microscopy, ShanghaiTech University, Shanghai 201210, China

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Corresponding author: a)Authors to whom correspondence should be addressed: ying@iphy.ac.cn and qiyp@shanghaitech.edu.cn; a)Authors to whom correspondence should be addressed: ying@iphy.ac.cn and qiyp@shanghaitech.edu.cn
Received Date: 2022-02-14
Accepted Date: 2022-04-14

Available Online: 2022-05-01

Publish Date: 2022-05-01

Abstract

Abstract

Clathrate-like or caged compounds have attracted great interest owing to their structural flexibility, as well as their fertile physical properties. Here, we report the pressure-induced reemergence of superconductivity in BaIr₂Ge₇ and Ba₃Ir₄Ge₁₆, two new caged superconductors with two-dimensional building blocks of cage structures. After suppression of the ambient-pressure superconducting (SC-I) states, new superconducting (SC-II) states emerge unexpectedly, with T_c increased to a maximum of 4.4 and 4.0 K for BaIr₂Ge₇ and Ba₃Ir₄Ge₁₆, respectively. Combined with high-pressure synchrotron x-ray diffraction and Raman measurements, we propose that the reemergence of superconductivity in these caged superconductors can be ascribed to a pressure-induced phonon softening linked to cage shrinkage.

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References(46)

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