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Dresden 2014 – scientific programme

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O: Fachverband Oberflächenphysik

O 82: Metal Substrates II

O 82.3: Talk

Thursday, April 3, 2014, 16:30–16:45, WIL A317

Probing Two-Band Superconductivity by Scanning Tunneling Spectroscopy — •Michael Ruby1, Benjamin W. Heinrich1, Jose I. Pascual1,2, 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

Recent DFT simulations have shown that the two separated Fermi-surfaces of the strong-coupling s-wave BCS superconductor lead (Pb) exhibit different character in momentum space, namely s-p- and p-d-like [1]. The two Fermi-surfaces make Pb a two-band superconductor with different gap parameter for each band. Using scanning tunneling spectroscopy (STS) we observe an energy difference of the gap parameters of ≈150 µV, and different intensity for each of the BCS resonances. We use the high spacial resolution of STS measurements to further investigate the influence of surface defects, adsorbates, and impurities on the density of states of the two-band superconductor.

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

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