Dresden 2011 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 10: Poster Session: Superconductivity
TT 10.40: Poster
Monday, March 14, 2011, 14:00–18:00, P4
Nonlinear transport near the superconductor/insulator transition in thin TiN films — •D Kalok1, A. Bilušić1,2, T.I. Baturina3,4, I. Schneider1, V.M. Vinokur4, and C. Strunk1 — 1Institute of Experimental and Applied Physics, University of Regensburg, Germany — 2Department of Physics, Faculty of Science, University of Split, Croatia — 3Institute of Semiconductor Physics, Novosibirsk, Russia — 4Materials Science Division, Argonne National Laboratory, Argonne, Illinois, USA
We investigate experimentally the electric transport at the insulating side of the superconductor to insulator transition in thin TiN-films. At temperatures T > 50 mK we observe an Arrhenius-type conductance, with an activation energy depending logarithmically on the sample size. At high bias the current voltage (I-V) characteristics display a large current jump into an electron heating dominated regime. For the largest samples, and below 50 mK we observe a low-bias power law I∝ Vα characteristics with an exponent α>1 rapidly growing with decreasing temperature, which is expected for a binding-unbinding crossover of the charge-Berezinskii-Kosterlitz-Thouless type.