Physics – Condensed Matter – Superconductivity
Scientific paper
2001-09-26
Physics
Condensed Matter
Superconductivity
8 pages, LaTeX, submitted to European Journal of Physics B
Scientific paper
10.1140/epjb/e20020091
The generation of harmonics of the voltage response is considered when an AC current is applied through a superconducting film above T_c. It is shown that almost at all temperatures the mechanism of the temperature oscillations created by the AC current and the temperature dependence of the resistance dominates over the isothermal nonlinear electric conductivity. Only in a narrow critical region close to T_c the latter is essential for the generation of the harmonics. A detailed investigation of harmonics generation provides an accurate method for measuring the thermal boundary conductance between the film and the insulating substrate. The critical behaviour of the third harmonic will give a new method for the determination of the lifetime of metastable Cooper pairs above T_c. The comparison of the calculated fifth harmonics of the voltage with the experiment is proposed as an important test for the applicability of the employed theoretical models.
Cheenne Nicolas
Indekeu Joseph
Mishonov Todor
Robbes Didier
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