Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 42: SC: Fe-based Superconductors - Fe(Se,Te)

TT 42.4: Talk

Wednesday, March 16, 2011, 19:30–19:45, HSZ 304

Tunnelling spectroscopy (SI-STM) study of Fe(Se,Te) — •Seth Cullen White, Udai Raj Singh, Yong Liu, Chengtian Lin, and Peter Wahl — Max-Planck-Institute for Solid State Research, Stuttgart, Germany

We use spectroscopic imaging scanning tunnelling microscopy (SI-STM) to investigate the local electronic structure of iron-based superconductors. Fe(Se,Te) has the simplest structure of these superconductors, consisting of planar iron layers with chalcogen anions above and below. The crystal structure provides a well defined cleavage plane between chalcogenide layers. In this study we map spatially the local density of states on a Fe_1.08Se_0.28Te_0.72 sample, which is superconducting below 14 K, revealing spectral features associated with defects. We investigate further the spectral features associated with excess Fe impurities, which are predicted to have a magnetic moment leading to local suppression of superconductivity.