The application of an overcritical current pulse I > Ic(T) to narrow YBa2Cu3O7 strips generates a phase-slip center after a certain delay time td. By analyzing this function td(I/Ic) through a time-dependent Ginzburg-Landau theory, one can extract the time of heat escape τesc from the film to the substrate. The parameter τesc was found to remain constant in the range from 5 to 40 K, but to increase notably above 40 K and up to Tc. We interpret this behavior as a manifestation of a Kapitza heat transfer by acoustic phonon radiation. The loss of transmissivity at higher temperatures is likely related to the rise of phonon-phonon decay processes.
Bibliographical noteFunding Information:
This work was supported by King Fahd University of Petroleum and Minerals under the IN131034 DSR Project.
© 2016 IEEE.
- Superconducting thin film
- critical current density
- heat transfer
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering