Berlin 2018 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 3: Superconductivity: Properties and Electronic Structure I
TT 3.3: Vortrag
Montag, 12. März 2018, 10:00–10:15, H 0110
Nonequilibrium transport in ultrathin aluminium films near the vortex-unbinding transition — •Klaus Kronfeldner, Lorenz Fuchs, and Christoph Strunk — Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany
We analyze I(V)-characteristics and ac-susceptibility of epitaxial aluminium films with thicknesses below 8 nm. The Berezinskii-Kosterlitz-Thouless transition temperature TBKT is determined from the superfluid stiffnesses that are extracted from both measurement techniques. For the dc-measurement the power-law criterion with slope 3 in log(V) vs. log(I) is used to determine TBKT. While the two independently identified values for TBKT are in good agreement for the lowest voltages V, at higher V a pronounced concave curvature is visible in the log(V) vs. log(I) plot. This curvature is traced back to both changes in the superfluid stiffness and self-heating in presence of a driving current.