Low-temperature scanning tunneling microscopy and spectroscopy of FeSe0.6Te0.4 single crystals

ORAL

Abstract

FeSe has the simplest crystal structure among Fe-based superconductors with a superconducting transition at TC ~ 9 K and a nematic transtion at TS ~ 90 K. By replacing 60% of Se with Te, FeSe1-xTex (x=0.6), TC increases up to 14 K and the superconducting gap structure changes from nodal to full-gap with the disappearance of the nematic phase transition. This system is therefore an ideal playground to understand the relationship between superconductivity and electronic nematicity in Fe-based superconductors. However, a difficulty in single-crystal growth in the phase-separation region (0<x<0.5) so far prevent a full understanding of the system [1]. We successfully grew single crystals in this region and performed electronic transport and low-temperature scanning tunneling microscopy and spectroscopy measurements on these crystals. The details will be discussed in the presentation. [1] M. Fang et al., PRB 78, 224503 (2008).

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Presenters

  • Yasuo Yoshida

    The Institute for Solid State Physics, The University of Tokyo, Institute for solid state physics, University of Tokyo

Authors

  • Yasuo Yoshida

    The Institute for Solid State Physics, The University of Tokyo, Institute for solid state physics, University of Tokyo

  • Hung-Hsiang Yang

    The Institute for Solid State Physics, The University of Tokyo, Institute for solid state physics, University of Tokyo

  • Yukio Hasegawa

    The Institute for Solid State Physics, The University of Tokyo, Institute for solid state physics, University of Tokyo

  • Kotaro Terao

    University of Tsukuba

  • Takanari Kashiwagi

    University of Tsukuba, Univ of Tsukuba, Graduate School of Pure and Applied Sciences, University of Tsukuba

  • Kazuo Kadowaki

    University of Tsukuba, Univ of Tsukuba, Institute of Materials Science, University of Tsukuba, Graduate School of Pure and Applied Sciences, University of Tsukuba