Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 17: Superconductivity: Properties and Electronic Structure

TT 17.3: Vortrag

Montag, 16. März 2015, 15:30–15:45, H 2053

Scanning tunneling spectroscopy of Co adsorbates on superconducting Pb nanostructures — •Regis Decker, Michael Caminale, Hirofumi Oka, Agneszka Stepniak, Augusto A. Leon Vanegas, Dirk Sander, and Jürgen Kirschner — Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany

Superconductivity in low-dimensional structures has become an active research area [1,2]. In order to understand the superconducting pairing, long-standing work has been devoted to the pair breaking effect, where magnetic impurities break Cooper pair singlets [3]. We performed scanning tunneling spectroscopy at low temperature on Co adsorbates on superconducting Pb nanoislands. On the Co adsorbates, we observe spectral features in the superconductor’s energy gap, which we attribute to magnetic impurity induced bound states [3], a hallmark of the pair breaking effect. We discuss the response of the superconducting islands to the presence of Co adsorbates.

[1] T. Nishio et al., Phys. Rev. Lett. 101, 167001 (2008).

[2] T. Zhang et al., Nature Phys. 6, 104 (2010).

[3] A. V. Balatsky et al., Rev. Mod. Phys. 78, 373 (2006).