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arXiv · 1809.05240

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

Feifei Yuan·Vadim Grinenko·Kazumasa Iida·Stefan Richter·Aurimas Pukenas·Werner Skrotzki·Masahito Sakoda·Michio Naito·Alberto Sala·Marina Putti·Aichi Yamashita·Yoshihiko Takano·Zhixiang Shi·Kornelius Nielsch·Ruben Huehne
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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 Hc2 at the superconducting transition temperature Tc (i.e. -dHc2/dT) for FeSe0.7Te0.3 thin films. The in-plane strain tunes Tc in a broad range, while the composition and disorder are almost unchanged. We show that -dHc2/dT scales linearly with Tc, 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.

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Feifei Yuan, Vadim Grinenko, Kazumasa Iida, Stefan Richter, Aurimas Pukenas, Werner Skrotzki, Masahito Sakoda, Michio Naito, Alberto Sala, Marina Putti, Aichi Yamashita, Yoshihiko Takano, Zhixiang Shi, Kornelius Nielsch, Ruben Huehne. 2018-09-14. Universal scaling behavior of the upper critical field in strained FeSe0.7Te0.3 thin films. https://doi.org/10.1088/1367-2630%2Faade66

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