Dresden 2014 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 30: Superconductivity - Poster Session
TT 30.46: Poster
Monday, March 31, 2014, 15:00–19:00, P2
Superconductor-Insulator Transition in thin TiN-films — •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 measured IV-characteristics and magnetoresistance of thin TiN-films in the vicinity of the disorder-tuned superconductor-insulator transition (SIT) for different square sizes (5µm to 240µm).
While the films are superconducting at B=0T, at finite magnetic fields a SIT occurs with a magnetoresistance peak between 1T<B(Rmax)<2.6T for the different sizes. For temperatures higher than T≈300mK the magnetoresistance curves cross at a single point between 0.7T<B(Rcross)<1.7T depending on the size and the R(B) behaves linear for small B. For lower temperatures down to T=20mK the R(B) rises faster than exponential for B<B(Rmax). The magnetoresistance of the smaller samples (5µm to 30µm) is significantly weaker than that of the bigger samples (60µm to 240µm).
The voltage-biased IV-characteristics reveal a highly non-monotonic behavior both at zero magnetic field and at B(Rmax).