Low-frequency magnetic noise and mutual inductance measurements indicate that the electromagnetic response of very thin Bi2Sr2CaCu2O8 films is dominated by Arrhenius law diffusion of thermally created vortices and antivortices. We explain the measured diffusion coefficient via pinning of the vortex cores on a single type of line defect. The observed superfluid response differs from simple Kosterlitz-Thouless predictions as it is predominantly controlled by vortex-pin rather than vortex-antivortex interactions.
ASJC Scopus subject areas
- General Physics and Astronomy