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TT: Fachverband Tiefe Temperaturen

TT 12: Poster Session Superconductivity

TT 12.18: Poster

Monday, March 11, 2013, 15:00–19:00, Poster D

Size dependence of the electric transport properties of thin TiN-films at the superconducting side of the SIT — •Klaus Kronfeldner¹, Tatyana Baturina², and Christoph Strunk¹ — ¹Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany — ²A. V. Rzhanov Institute of Semiconductor Physics SB RAS, Novosibirsk 630090, Russia

We investigate the electric transport at the superconducting side of the superconductor-insulator transition (SIT) in square-shaped thin TiN-films and its dependence on their lateral size. The resistance at room temperature was tuned by heating up the sample in air, in order to approach the SIT. We revealed a size-dependent magnetoresistance. For the smaller samples a very small magnetic field is sufficient to induce a finite resistance. The larger samples remain superconducting nearly up the nominal critical field (B ≈ 2.8T) of the TiN-material.