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Intermediately coupled type-II superconductivity in a La-based kagome metal La3Al |
| Yingpeng Yu(于英鹏)1,2, Zhaolong Liu(刘兆龙)1,3, Zhaoxu Chen(陈昭旭)1,4, Qi Li(李琦)1,3, Yulong Wang(王玉龙)1,4, Xuhui Wang(王旭辉)1,2, Chunsheng Gong(龚春生)5, Zhaotong Zhuang(庄照通)1,2, Bin-Bin Ruan(阮彬彬)1, Huifen Ren(任会芬)1,2, Peijie Sun(孙培杰)1, Jian-Gang Guo(郭建刚)1,6, and Shifeng Jin(金士锋)1† |
1 Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 101408, China;
4 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
5 Beijing Lattice Semiconductor Co., Ltd., Beijing 101300, China;
6 Songshan Lake Materials Laboratory, Dongguan 523808, China |
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Abstract We present a comprehensive investigation into the superconducting properties of La$_{3}$Al, a La-based metal with a kagome structure. La$_{3}$Al crystallizes in a Ni$_{3}$Sn-type crystal structure (space group $P6_{3}/mmc$), where the La atoms form a kagome lattice. Resistivity measurements reveal superconducting transition with $T_{\rm c}^{\rm onset}=6.37$ K and $T_{\rm c}^{\rm zero}=6.18$ K. In magnetic susceptibility measurements, the superconducting transition is observed at 6.16 K. The lower and upper critical fields are determined to be 22.17 mT and 6.69 T, respectively. Heat capacity measurements confirm the bulk superconductivity, showing a normalized specific heat change of ${\Delta C_{\rm e}} / (\gamma T_{\rm c})=2.16$ and an electron-phonon coupling strength of $\lambda_{\rm ep} =0.9 2$. DFT calculations reveal the intricate band structure of La$_{3}$Al. The notable specific heat jump, coupled with the electron-phonon coupling strength $\lambda_{\rm ep}$, indicates that La$_{3}$Al exhibits characteristics of an intermediately coupled type-II superconductor.
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Received: 14 August 2024
Revised: 05 November 2024
Accepted manuscript online: 07 November 2024
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PACS:
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74.70.Ad
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(Metals; alloys and binary compounds)
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74.25.F-
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(Transport properties)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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74.25.Ha
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(Magnetic properties including vortex structures and related phenomena)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 52272268 and 52250308), the Strategic Priority Research Program and Key Research Program of Frontier Sciences of the Chinese Academy of Sciences (Grant No. XDB33010100), the Informatization Plan of Chinese Academy of Sciences (Grant No. CAS-WX2021SF-0102), and the Synergetic Extreme Condition User Facility (SECUF). |
Corresponding Authors:
Shifeng Jin
E-mail: shifengjin@iphy.ac.cn
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| About author: 2025-017401-241180.pdf |
Cite this article:
Yingpeng Yu(于英鹏), Zhaolong Liu(刘兆龙), Zhaoxu Chen(陈昭旭), Qi Li(李琦), Yulong Wang(王玉龙), Xuhui Wang(王旭辉), Chunsheng Gong(龚春生), Zhaotong Zhuang(庄照通), Bin-Bin Ruan(阮彬彬), Huifen Ren(任会芬), Peijie Sun(孙培杰), Jian-Gang Guo(郭建刚), and Shifeng Jin(金士锋) Intermediately coupled type-II superconductivity in a La-based kagome metal La3Al 2025 Chin. Phys. B 34 017401
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