| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Superconductivity and Normal-State Properties of Kagome Metal RbV$_{3}$Sb$_{5}$ Single Crystals |
| Qiangwei Yin†, Zhijun Tu†, Chunsheng Gong†, Yang Fu , Shaohua Yan , and Hechang Lei* |
| Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China |
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| Cite this article: |
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Qiangwei Yin, Zhijun Tu, Chunsheng Gong et al 2021 Chin. Phys. Lett. 38 037403 |
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Abstract We report the discovery of superconductivity and detailed normal-state physical properties of RbV$_{3}$Sb$_{5}$ single crystals with V kagome lattice. RbV$_{3}$Sb$_{5}$ single crystals show a superconducting transition at $T_{\rm c}\sim 0.92$ K. Meanwhile, resistivity, magnetization and heat capacity measurements indicate that it exhibits anomalies of properties at $T^{*}\sim 102$–103 K, possibly related to the formation of charge ordering state. When $T$ is lower than $T^{*}$, the Hall coefficient $R_{\rm H}$ undergoes a drastic change and sign reversal from negative to positive, which can be partially explained by the enhanced mobility of hole-type carriers. In addition, the results of quantum oscillations show that there are some very small Fermi surfaces with low effective mass, consistent with the existence of multiple highly dispersive Dirac band near the Fermi energy level.
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Received: 26 January 2021
Published: 23 February 2021
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| PACS: |
74.70.Dd
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(Ternary, quaternary, and multinary compounds)
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71.45.Lr
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(Charge-density-wave systems)
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72.15.Eb
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(Electrical and thermal conduction in crystalline metals and alloys)
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71.70.Di
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(Landau levels)
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| Fund: Supported by the National Natural Science Foundation of China (Grant Nos. 11822412 and 11774423), the National Key R&D Program of China (Grant Nos. 2018YFE0202600 and 2016YFA0300504), the Beijing Natural Science Foundation (Grant No. Z200005), the Fundamental Research Funds for the Central Universities, the Research Funds of Renmin University of China (RUC) (Grant Nos. 18XNLG14 and 19XNLG17), and the Beijing National Laboratory for Condensed Matter Physics. |
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