Quasi-Two-Dimensional Nature of High-$T_{\rm c}$ Superconductivity in Iron-Based (Li,Fe)OHFeSe

doi:10.1088/0256-307X/39/12/127402

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Abstract：The intercalated iron selenide (Li,Fe)OHFeSe has a strongly layered structure analogous to the quasi-two-dimensional (2D) bismuth cuprate superconductors, and exhibits both high-temperature ($T_{\rm c}$) and topological superconductivity. However, the issue of its superconductivity dimensionality has not yet been fully investigated so far. Here we report that the quasi-2D superconductivity features, including the high anisotropy $\gamma = 151$ and the associated quasi-2D vortices, are also revealed for (Li,Fe)OHFeSe, based on systematic experiments of the electrical transport and magnetization and model fittings. Thus, we establish a new vortex phase diagram for (Li,Fe)OHFeSe, which delineates an emergent quasi-2D vortex-liquid state, and a subsequent vortex-solid dimensional crossover from a pancake-like to a three-dimensional state with decreasing temperature and magnetic field. Furthermore, we find that all the quasi-2D characteristics revealed here for the high-$T_{\rm c}$ iron selenide superconductor are very similar to those reported for high-$T_{\rm c}$ bismuth cuprate superconductors.

收稿日期: 2022-11-02 Express Letter 出版日期: 2022-11-25

:	74.70.Xa	(Pnictides and chalcogenides)
	74.78.-w	(Superconducting films and low-dimensional structures)
	74.25.F-	(Transport properties)
	74.25.Uv	(Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses))

引用本文:

. [J]. 中国物理快报, 2022, 39(12): 127402-127402.
Dong Li, Yue Liu, Zouyouwei Lu, Peiling Li, Yuhang Zhang, Sheng Ma, Jiali Liu, Jihu Lu, Hua Zhang, Guangtong Liu, Fang Zhou, Xiaoli Dong, and Zhongxian Zhao. Quasi-Two-Dimensional Nature of High-$T_{\rm c}$ Superconductivity in Iron-Based (Li,Fe)OHFeSe. Chin. Phys. Lett., 2022, 39(12): 127402-127402.

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https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/39/12/127402 或 https://cpl.iphy.ac.cn/CN/Y2022/V39/I12/127402

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