Superconducting fluctuations in FeSe${}_{0.5}$Te${}_{0.5}$ thin films probed via microwave spectroscopy

Abstract

We investigated the microwave conductivity spectrum of FeSe${}_{0.5}$Te${}_{0.5}$ epitaxial films on CaF${}_2$ in the vicinity of the superconducting transition. We observed the critical behavior of the superconducting fluctuations in these films with a dimensional crossover from two-dimensional to three-dimensional as the film thickness increased. From the temperature dependence of the scaling parameters we conclude that the universality class of the superconducting transition in FeSe${}_{0.5}$Te${}_{0.5}$ is that of the 3D-XY model. The lower limit of the onset temperature of the superconducting fluctuations, Tonset, determined by our measurements was 1.1 Tc, suggesting that the superconducting fluctuations of FeSe${}_{0.5}$Te${}_{0.5}$ are at least as large as those of optimally- and over-doped cuprates.

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• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• The effect of superconducting fluctuations on the ac conductivity of a 2D electron system in the diffusive regime
• Study on fluctuations of interface-enhanced superconductivity in ultrathin FeSe/SrTiO3 by the Nernst effect
• Short-lived electron excitations in $\mathrm{FeT}{\mathrm{e}}_{1-\mathrm{x}}\mathrm{S}{\mathrm{e}}_{\mathrm{x}}$ as revealed by microwave absorption