| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Hydrothermally Obtaining Superconductor Single Crystal of FeSe$_{0.2}$Te$_{0.8}$ without Interstitial Fe |
| Sheng Ma1,2†, Shanshan Yan3†, Jiali Liu1,2, Yizhe Wang3, Yuhang Zhang1,2, Zhen Zhao1,2, Zouyouwei Lu1,2, Dong Li1, Yue Liu1,2, Jihu Lu1,2, Hua Zhang1,2,4, Haitao Yang1,2,5, Fang Zhou1,2,4, Zian, Li3*, Xiaoli Dong1,2,4*, and Zhongxian Zhao1,2,4 |
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
3School of Physical Science and Technology, Guangxi University, Nanning 530004, China
4Songshan Lake Materials Laboratory, Dongguan 523808, China
5CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China
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| Cite this article: |
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Sheng Ma, Shanshan Yan, Jiali Liu et al 2023 Chin. Phys. Lett. 40 067402 |
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Abstract We report a hydrothermal route to remove interstitial excess Fe in non-superconducting iron chalcogenide Fe$_{1+\delta}$Se$_{1-x}$Te$_{x}$ single crystals. The extra-Fe-free ($\delta \sim 0$) FeSe$_{0.2}$Te$_{0.8}$ single crystal thus obtained shows bulk superconductivity at $T_{\rm c} \sim 13.8$ K, which is about 2 K higher than the FeSe$_{0.2}$Te$_{0.8}$ sample obtained by usual post-annealing process. The upper critical field $\mu_{0}H_{\rm c2}$ is estimated to be $\sim$ $42.5$ T, similar to the annealed FeSe$_{0.2}$Te$_{0.8}$. It is surprising to find that the hydrothermal FeSe$_{0.2}$Te$_{0.8}$ exhibits a remarkably small isothermal magnetization hysteresis loop at $T = 3$ K. This yields an extremely low critical current density $J_{\rm c} \sim 1.1\times 10^{2}$ A$\cdot$cm$^{-2}$ (over 100 times smaller than the annealed FeSe$_{0.2}$Te$_{0.8}$) and indicates more free vortices in the hydrothermal FeSe$_{0.2}$Te$_{0.8}$.
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Received: 15 April 2023
Editors' Suggestion
Published: 23 May 2023
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| PACS: |
74.25.-q
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(Properties of superconductors)
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74.25.Ha
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(Magnetic properties including vortex structures and related phenomena)
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74.25.Op
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(Mixed states, critical fields, and surface sheaths)
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74.25.Sv
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(Critical currents)
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