Berlin 2012 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 23: Superconductivity: Fe-based Superconductors - Fe(Se/Te)

TT 23.5: Talk

Wednesday, March 28, 2012, 10:30–10:45, H 2053

Superconductivity of Fe_1.07Se_0.5Te_0.5 studied by Spectroscopic-Imaging Scanning Tunneling Microscopy — •Udai Raj Singh¹, Seth White¹, Stefan Schmaus¹, Joachim Deisenhofer², Vladimir Tsurkan², Alois Loidl², and Peter Wahl¹ — ¹Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany — ²Lehrstuhl für Experimentalphysik V, Universität Augsburg, Augsburg, Germany

The unconventional superconductivity in the recently discovered iron-based superconductors has become an active field of research [1]. We study the electronic structure of Fe_1.07Se_0.5Te_0.5 (T_c ∼ 15 K) by spectroscopic-imaging scanning tunneling microscopy (SI-STM). SI-STM has been shown to be an important tool to investigate the electronic inhomogeneities and electronic structure in high temperature superconductors [2]. The iron chalcogenide superconductor Fe_1.07Se_0.5Te_0.5 provides a well defined cleavage plane, making it an ideal candidate for STM investigation. We find the superconducting gap consistent with earlier studies [3]. We show in our study the temperature dependence of the superconducting gap. We observe significant nanoscale inhomogeneity of the superconducting gap.
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T. Hanaguri, et al., Science 328, 474 (2010).