| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Superconductivity in the Layered Cage Compound Ba$_{3}$Rh$_{4}$Ge$_{16}$ |
| Yi Zhao1,2, Jun Deng3, A. Bhattacharyya4*, D. T. Adroja5,6, P. K. Biswas5, Lingling Gao1, Weizheng Cao1, Changhua Li1, Cuiying Pei1, Tianping Ying3,7, Hideo Hosono7, and Yanpeng Qi1* |
1School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
2University of Chinese Academy of Science, Beijing 100049, China
3Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
4Department of Physics, Ramakrishna Mission Vivekananda Educational and Research Institute, Belur Math, Howrah 711202, West Bengal, India
5ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot Oxon, OX11 0QX, United Kingdom
6Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
7Materials Research Center for Element Strategy, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan
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| Cite this article: |
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Yi Zhao, Jun Deng, A. Bhattacharyya et al 2021 Chin. Phys. Lett. 38 127402 |
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Abstract We report the synthesis and superconducting properties of a layered cage compound Ba$_{3}$Rh$_{4}$Ge$_{16}$. Similar to Ba$_{3}$Ir$_{4}$Ge$_{16}$, the compound is composed of 2D networks of cage units, formed by noncubic Rh–Ge building blocks, in marked contrast to the reported rattling compounds. The electrical resistivity, magnetization, specific heat capacity, and μSR measurements unveiled moderately coupled s-wave superconductivity with a critical temperature $T_{\rm c}=7.0$ K, the upper critical field $\mu_{0}H_{\rm c2}(0) \sim 2.5$ T, the electron-phonon coupling strength $\lambda_{\rm e-ph} \sim 0.80$, and the Ginzburg–Landau parameter $\kappa \sim 7.89$. The mass reduction with the substitution of Ir by Rh is believed to be responsible for the enhancement of $T_{\rm c}$ and coupling between the cage and guest atoms. Our results highlight the importance of atomic weight of framework in cage compounds in controlling the $\lambda_{\rm e-ph}$ strength and $T_{\rm c}$.
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Received: 12 October 2021
Published: 27 November 2021
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| PACS: |
74.25.Ha
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(Magnetic properties including vortex structures and related phenomena)
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74.25.F-
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(Transport properties)
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74.25.-q
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(Properties of superconductors)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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| Fund: Supported the National Key R&D Program of China (Grant No. 2018YFA0704300), the National Natural Science Foundation of China (Grant Nos. U1932217, 11974246, and 12004252), the Natural Science Foundation of Shanghai (Grant No. 19ZR1477300), the Science and Technology Commission of Shanghai Municipality (Grant No. 19JC1413900), and the Analytical Instrumentation Center, SPST, ShanghaiTech University (Grant No. SPST-AIC10112914). A. Bhattacharyya would like to acknowledge the SERB, India for Core Research grant support and UK-India Newton Funding for funding support. D. T. Adroja would like to thank the Royal Society of London for Newton Advanced Fellowship funding and International Exchange funding between UK and Japan. We thank ISIS Facility for beam time (Grant No. RB1968041). |
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