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

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

Chin. Phys. Lett.

2022, Vol. 39

Issue (12): 127402 DOI: 10.1088/0256-307X/39/12/127402

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

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

Dong Li^1†*, Yue Liu^1,2†, Zouyouwei Lu^1,2†, Peiling Li¹, Yuhang Zhang^1,2, Sheng Ma^1,2, Jiali Liu^1,2, Jihu Lu^1,2, Hua Zhang^1,2,3, Guangtong Liu^1,2,3, Fang Zhou^1,2,3, Xiaoli Dong^1,2,3,4*, and Zhongxian Zhao^1,2,3,4

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
³Songshan Lake Materials Laboratory, Dongguan 523808, China
⁴Key Laboratory for Vacuum Physics, University of Chinese Academy of Sciences, Beijing 100049, China

Cite this article:

Dong Li, Yue Liu, Zouyouwei Lu et al 2022 Chin. Phys. Lett. 39 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.

Received: 02 November 2022 Express Letter Published: 25 November 2022

PACS:	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))

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

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	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

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