| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Mott Transition and Superconductivity in Quantum Spin Liquid Candidate NaYbSe$_{2}$ |
| Ya-Ting Jia1,2†, Chun-Sheng Gong3†, Yi-Xuan Liu3, Jian-Fa Zhao1, Cheng Dong4, Guang-Yang Dai1, Xiao-Dong Li5, He-Chang Lei3*, Run-Ze Yu1*, Guang-Ming Zhang6,7, and Chang-Qing Jin1,2* |
1Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2University of Chinese Academy of Sciences, Beijing 100190, China
3Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials & Micro-nano Devices, Renmin University of China, Beijing 100872, China
4Peking University Shenzhen Graduate School, School of Advanced Materials, Shenzhen 518055, China
5Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
6State Key Laboratory of Low-Dimensional Quantum Physics and Department of Physics, Tsinghua University, Beijing 100084, China
7Frontier Science Center for Quantum Information, Beijing 100084, China
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| Cite this article: |
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Ya-Ting Jia, Chun-Sheng Gong, Yi-Xuan Liu et al 2020 Chin. Phys. Lett. 37 097404 |
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Abstract The Mott transition is one of the fundamental issues in condensed matter physics, especially in the system with antiferromagnetic long-range order. However, such a transition is rare in quantum spin liquid (QSL) systems without long-range order. Here we report the experimental pressure-induced insulator to metal transition followed by the emergence of superconductivity in the QSL candidate NaYbSe$_{2}$ with a triangular lattice of 4$f$ Yb$^{3+}$ ions. Detail analysis of transport properties in metallic state shows an evolution from non-Fermi liquid to Fermi liquid behavior when approaching the vicinity of superconductivity. An irreversible structure phase transition occurs around 11 GPa, which is revealed by the x-ray diffraction. These results shed light on the Mott transition in the QSL systems.
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Received: 19 August 2020
Published: 26 August 2020
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| Fund: This work was supported by the National Key R&D Program of China (Grant Nos. 2016YFA0300504, 2018YFE0202600 and 2018YFA0305701), the National Natural Science Foundation of China (Grant Nos. 11774423, 11822412 and 11921004), the Fundamental Research Funds for the Central Universities, and the Research Funds of Renmin University of China (Grant Nos. 18XNLG14 and 19XNLG17). |
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