Comparison of S- and Te-substitution effects in FeSe thin films

ORAL

Abstract

We have successfully grown single crystalline films of FeSe1−xSx with x ≤ 0.43 via pulsed laser deposition. As x increases, the structural transition temperature decreases and the superconducting transition temperature, Tc, shows a gradual decrease even when the structural transition disappears. We observed a new kink structure in the resistivity-temperature curves for films with large x, which is likely due to a magnetic transition. The obtained phase diagram of FeSe1−xSx is in contrast to that of FeSe1−yTey films, which shows a sudden increase of Tc at the composition where the structural transition disappears[1]. These results demonstrate that the relationship between the nematicity and the superconductivity is not universal in FeSe, suggesting that the nematicity does not play a primary role in the superconductivity in this system[2].
[1] Y. Imai et al., Sci. Rep. 7, 46653 (2017).
[2] F. Nabeshima et al., J. Phys. Soc. Jpn. 87, 073704 (2018).

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Presenters

  • Fuyuki Nabeshima

    Department of Pure and Applied Sciences, University of Tokyo, University of Tokyo

Authors

  • Fuyuki Nabeshima

    Department of Pure and Applied Sciences, University of Tokyo, University of Tokyo

  • Tomoya Ishikawa

    University of Tokyo

  • Naoki Shikama

    University of Tokyo

  • Atsutaka Maeda

    Department of Pure and Applied Sciences, University of Tokyo, University of Tokyo