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Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 58: Electronic Structure of Surfaces II

O 58.1: Talk

Wednesday, March 18, 2015, 15:00–15:15, MA 041

Two-band superconductivity of lead probed by scanning tunneling spectroscopy — •Michael Ruby1, Benjamin W. Heinrich1, Jose I. Pascual2, and Katharina J. Franke11Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — 2CIC nanoGUNE and Ikerbasque, Basque Foundation for Science, Tolosa Hiribidea 78, Donostia-San Sebastian 20018, Spain

The type I superconductor lead (Pb) has been theoretically predicted to be a two-band superconductor [1]. We use scanning tunneling spectroscopy to resolve two superconducting gaps with an energy difference of 130 µeV. Tunneling into Pb(111), Pb(110) and Pb(100) crystals reveals a strong dependence of the two coherence peak intensities on the crystal orientation. We show that this is the result of a selective tunneling into the two bands at the energy of the two coherence peaks. This is further sustained by the observation of signatures of the Fermi sheets in differential conductance maps around subsurface defects.

A. Floris et al., Phys. Rev. B 75, 054508, (2007)

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