Quasi two-dimensional nature of high-Tc superconductivity in iron-based (Li,Fe)OHFeSe

TL;DR

This study demonstrates the quasi-two-dimensional nature of high-Tc superconductivity in (Li,Fe)OHFeSe through experiments revealing high anisotropy, vortex behavior, and a vortex phase diagram, drawing parallels with cuprate superconductors.

Contribution

It provides the first systematic experimental evidence of quasi-2D superconductivity features and vortex behavior in (Li,Fe)OHFeSe, establishing its similarity to cuprate superconductors.

Findings

High anisotropy γ = 151 indicating strong 2D characteristics

Identification of a vortex-liquid state and vortex-solid crossover

Similarity of quasi-2D features to high-Tc cuprate superconductors

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 (Tc) 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-Tc iron selenide superconductor are very similar to those reported for the high-Tc bismuth cuprate superconductors.