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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 Fe1.07Se0.5Te0.5 studied by Spectroscopic-Imaging Scanning Tunneling Microscopy — •Udai Raj Singh1, Seth White1, Stefan Schmaus1, Joachim Deisenhofer2, Vladimir Tsurkan2, Alois Loidl2, and Peter Wahl11Max-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 Fe1.07Se0.5Te0.5 (Tc ∼ 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 Fe1.07Se0.5Te0.5 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.
Y. Kamihara, et al., J. Am. Chem. Soc. 128, 10012 (2006) and Y. Kamihara, et al., J. Am. Chem. Soc. 130, 3296 (2008).
J. E. Hoffman, et al., Science 297, 1148 (2002); K. McElroy, et al., Nature 422, 592 (2003).
T. Hanaguri, et al., Science 328, 474 (2010).

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