Superconductivity in kagome metal ThRu3Si2

doi:10.1088/1674-1056/ad1c5e

中国物理B ›› 2024, Vol. 33 ›› Issue (5): 57401-057401.doi: 10.1088/1674-1056/ad1c5e

所属专题： SPECIAL TOPIC — Recent progress on kagome metals and superconductors

Superconductivity in kagome metal ThRu₃Si₂

Yi Liu(刘艺)^1,2,†,‡, Jing Li(厉静)^1,†, Wu-Zhang Yang(杨武璋)³, Jia-Yi Lu(卢佳依)¹, Bo-Ya Cao(曹博雅)², Hua-Xun Li(李华旬)¹, Wan-Li Chai(柴万力)¹, Si-Qi Wu(武思祺)¹, Bai-Zhuo Li(李佰卓)⁴, Yun-Lei Sun(孙云蕾)⁵, Wen-He Jiao(焦文鹤)², Cao Wang(王操)⁴, Xiao-Feng Xu(许晓峰)², Zhi Ren(任之)³, and Guang-Han Cao(曹光旱)^1,6,7,§

1 School of Physics, Zhejiang University, Hangzhou 310058, China;
2 Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China;
3 School of Science, Westlake Institute for Advanced Study, Westlake University, Hangzhou 310064, China;
4 Department of Physics, Shandong University of Technology, Zibo 255049, China;
5 School of Information and Electrical Engineering, Zhejiang University City College, Hangzhou 310015, China;
6 Interdisciplinary Center for Quantum Information, and State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou 310058, China;
7 Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing 210093, China

收稿日期:2023-12-22 修回日期:2024-01-05 接受日期:2024-01-09 出版日期:2024-05-20 发布日期:2024-05-20
通讯作者: Yi Liu, Guang-Han Cao E-mail:liuyiphy@zjut.edu.cn;ghcao@zju.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12050003, 12004337, and 12274369) and the Zhejiang Provincial Natural Science Foundation of China (Grant No. LQ21A040011).

Superconductivity in kagome metal ThRu₃Si₂

1 School of Physics, Zhejiang University, Hangzhou 310058, China;
2 Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China;
3 School of Science, Westlake Institute for Advanced Study, Westlake University, Hangzhou 310064, China;
4 Department of Physics, Shandong University of Technology, Zibo 255049, China;
5 School of Information and Electrical Engineering, Zhejiang University City College, Hangzhou 310015, China;
6 Interdisciplinary Center for Quantum Information, and State Key Laboratory of Silicon and Advanced Semiconductor Materials, Zhejiang University, Hangzhou 310058, China;
7 Collaborative Innovation Centre of Advanced Microstructures, Nanjing University, Nanjing 210093, China

Received:2023-12-22 Revised:2024-01-05 Accepted:2024-01-09 Online:2024-05-20 Published:2024-05-20
Contact: Yi Liu, Guang-Han Cao E-mail:liuyiphy@zjut.edu.cn;ghcao@zju.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 12050003, 12004337, and 12274369) and the Zhejiang Provincial Natural Science Foundation of China (Grant No. LQ21A040011).

摘要/Abstract

摘要： We report the physical properties of ThRu$_3$Si$_2$ featured with distorted Ru kagome lattice. The combined experiments of resistivity, magnetization and specific heat reveal bulk superconductivity with $T_{\rm{c}}= 3.8$ K. The specific heat jump and calculated electron-phonon coupling indicate a moderate coupled BCS superconductor. In comparison with LaRu$_3$Si$_2$, the calculated electronic structure in ThRu$_3$Si$_2$ shows an electron-doping effect with electron filling lifted from 100 meV below flat bands to 300 meV above it. This explains the lower superconducting transition temperature and weaker electron correlations observed in ThRu$_3$Si$_2$. Our work suggests the $T_{\rm{c}}$ and electronic correlations in the kagome superconductor could have an intimate connection with the flat bands.

关键词: superconductivity, kagome lattice, flat band

Abstract: We report the physical properties of ThRu$_3$Si$_2$ featured with distorted Ru kagome lattice. The combined experiments of resistivity, magnetization and specific heat reveal bulk superconductivity with $T_{\rm{c}}= 3.8$ K. The specific heat jump and calculated electron-phonon coupling indicate a moderate coupled BCS superconductor. In comparison with LaRu$_3$Si$_2$, the calculated electronic structure in ThRu$_3$Si$_2$ shows an electron-doping effect with electron filling lifted from 100 meV below flat bands to 300 meV above it. This explains the lower superconducting transition temperature and weaker electron correlations observed in ThRu$_3$Si$_2$. Our work suggests the $T_{\rm{c}}$ and electronic correlations in the kagome superconductor could have an intimate connection with the flat bands.

Key words: superconductivity, kagome lattice, flat band

中图分类号: (Superconducting materials other than cuprates)

74.70.-b

74.25.-q (Properties of superconductors) 74.25.Ha (Magnetic properties including vortex structures and related phenomena)

Yi Liu(刘艺), Jing Li(厉静), Wu-Zhang Yang(杨武璋), Jia-Yi Lu(卢佳依), Bo-Ya Cao(曹博雅), Hua-Xun Li(李华旬), Wan-Li Chai(柴万力), Si-Qi Wu(武思祺), Bai-Zhuo Li(李佰卓), Yun-Lei Sun(孙云蕾), Wen-He Jiao(焦文鹤), Cao Wang(王操), Xiao-Feng Xu(许晓峰), Zhi Ren(任之), and Guang-Han Cao(曹光旱). Superconductivity in kagome metal ThRu₃Si₂[J]. 中国物理B, 2024, 33(5): 57401-057401.

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Superconductivity in kagome metal ThRu₃Si₂

Superconductivity in kagome metal ThRu₃Si₂

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