Regensburg 2010 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

TT: Fachverband Tiefe Temperaturen

TT 37: MLT: Poster Session

TT 37.1: Poster

Donnerstag, 25. März 2010, 14:00–18:00, Poster A

Superconductor-insulator transition in TiN films — •David Kalok¹, Ante Bilušić^1,2, Tatyana Baturina³, Mikhaïl Baklanov⁴, Valerii Vinokur⁵, and Christoph Strunk¹ — ¹Institute for Experimental and Applied Physics, University of Regensburg, Germany — ²Department on Physics, University of Split, Croatia — ³Institute of Semiconductor Physics, Novosibirsk, Russia — ⁴IMEC, Leuven, Belgium — ⁵Materials Science Division, Argonne National Laboratory, USA

In the past years, several unusual features of the insulating state terminating superconductivity in strongly disordered superconducting films have been revealed. We investigate low-temperature transport properties of thin TiN films on the insulating side of the superconductor-insulator transition (SIT). At higher temperature, T≥ 50 mK, we observe a thermally activated conductance with activation energy E_A/k_b=0.5 K. At lower temperatures, IV measurements show a threshold voltage V_T, below which the conductance is orders of magnitudes lower. Activation energy E_A and threshold V_T depend in a non-monotonic way on magnetic field and moreover on the orientation of the magnetic field. The influence of electron heating on the switching mechanism is investigated. We explore the B-Field driven SIT in parallel and perpendicular field.