Measurement of the gap relaxation time of superconducting NbTi strips on a sapphire substrate

We report on the creation of resistive states in NbTi superconducting filament on polished crystalline Al2O3 using the current driven pulse technique. A current pulse larger than the depairing current (Ic) initiates a dissipation in a localized spot. The non-equilibrium state described by the two dissipative mechanism pinpointed as hotspot and phase slip center. A time dependent voltage response exposes the collapse of superconductivity that occurs after a certain delay time td. We found that hotspots occur at temperatures much lower than the transition temperature. This can be clearly seen in a current versus temperature diagram. The thermal cooling and heat escape times were extracted from fitting the experimental data of the delay time to Tinkham’s amended version of the Time-Dependent Ginzburg-Landau (TDGL). The temperatures reached at the core of hotspots were determined without any parameter adjustment.

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Measurement of the gap relaxation time of superconducting NbTi strips on a sapphire substrate

Cited by 2 publications

References 19 publications

Current-Induced Metastable States Close to T$$_{c}$$ in NbTi Superconducting Bridges

Current-Induced Metastable States Close to T$$_{c}$$ in NbTi Superconducting Bridges

Characterization of Resistive Hotspots induced in Superconducting NbTi thin film by an electrical current pulse

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