Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.76: Poster

Tuesday, March 27, 2012, 18:15–21:45, Poster B

Metal- Porphyrins on metallic and superconducting surfaces — •Nino R. Hatter, Benjamin W. Heinrich, Lukas Z. Braun, Tobias R. Umbach, Jose I. Pascual, and Katharina J. Franke — Institut für Experimentalphysik, Freie Universität Berlin, Germany

While magnetic properties of single magnetic molecules on metal surfaces have been vividly studied in the last years, only little research has been done on magnetic impurities on superconducting substrates. On metal surfaces spin-excitations or Kondo screening can be observed. On a superconductor exchange coupling to Cooper pairs adds another complex many-body interaction, which is competing with Kondo screening[1,2,3]. Here we present a comparative study of metal-porphyrins on Au(111) and on the type-I superconductor Pb(111) using Scanning Tunneling Microscopy/Spectroscopy (STM/STS).

[1] K.J. Franke, G. Schulze, J.I. Pascual, Science 332, 940 (2011), [2] A. Yazdani et al., Science 275, 1767 (1997), [3] H. Shiba, Prog. Theor. Phys. 40, 435 (1968)