Probing the superconducting gap structure of (Li${}_{1-x}$Fe${}_x$)OHFeSe

Abstract

We report measurements of the London penetration depth [$\Delta \lambda (T)$] of the recently discovered iron-based superconductor (Li${}_{1-x}$Fe${}_x$)OHFeSe, in order to characterize the nature of the superconducting gap structure. At low temperatures, $\Delta \lambda (T)$ displays nearly temperature independent behavior, indicating a fully open superconducting gap. We also analyze the superfluid density ${\rho }_s(T)$ which cannot be well accounted for by a single-gap isotropic $s$-wave model but are consistent with either two-gaps, a model for the orbital selective $s\times {\tau }_3$ state or anisotropic $s$-wave superconductivity.

arXiv comment6 pages, 3 figures

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• Nodeless multigap superconductivity in organic-ion-intercalated (tetrabutyl~ammonium)${}_{0.3}$FeSe
• Electronic and Superconducting Properties of Some FeSe-based Single Crystals and Films Grown Hydrothermally