Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 33: Superconductivity, Measuring Devices, Matter at Low Temperature: Poster Session

TT 33.21: Poster

Mittwoch, 28. März 2012, 15:00–19:00, Poster B

Superconductor-insulator transition in disordered FeSe thin films — •Rudolf Schneider, Alexander G. Zaitsev, and Dirk Fuchs — Karlsruher Institut für Technologie, Institut für Festkörperphysik, Karlsruhe, Germany

The evolution of the temperature-dependent sheet resistance with increasing disorder in epitaxial c-axis oriented FeSe thin films was studied. Disorder was induced by decreasing the thickness of identically prepared stoichiometric films. At critical values of the thickness and sheet resistance a transition from the superconducting to the insulating state occurred. The critical sheet resistance was three times the supposed universal quantum resistance for pairs of electrons. Finite-size scaling analysis in the critical regime according to the Bose-glass model revealed a critical exponent product of 7/3 compatible with the prediction of a quantum percolation transition.