Universal scaling behavior of the upper critical field in strained FeSe0.7Te0.3 thin films

Abstract

Revealing the universal behaviors of iron-based superconductors (FBS) is important to elucidate the microscopic theory of superconductivity. In this work, we investigate the effect of in-plane strain on the slope of the upper critical field H c2 at the superconducting transition temperature T c (i.e. -dH c2/dT) for FeSe0.7Te0.3 thin films. The in-plane strain tunes T c in a broad range, while the composition and disorder are almost unchanged. We show that -dH c2/dT scales linearly with T c, indicating that FeSe0.7Te0.3 follows the same universal behavior as observed for pnictide FBS. The observed behavior is consistent with a multiband superconductivity paired by interband interaction such as sign change s ± superconductivity.

Description
Keywords
Iron compounds, Selenium compounds, Single crystals, Strain, Superconducting films, Superconducting transition temperature, Technetium, Tellurium compounds, Thin films, Effect of In, In-plane strains, Microscopic theory, Multiband superconductivity, Sign-change, Universal behaviors, Universal scaling, Upper critical fields, Iron-based Superconductors, Fe-based superconductors, thin film, upper critical fields
Citation
Yuan, F., Grinenko, V., Iida, K., Richter, S., Pukenas, A., Skrotzki, W., et al. (2018). Universal scaling behavior of the upper critical field in strained FeSe0.7Te0.3 thin films. 20(9). https://doi.org//10.1088/1367-2630/aade66
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License
CC BY 3.0 Unported