Characterization of Resistive Hotspots induced in Superconducting NbTi thin film by an electrical current pulse. (26th May 2021)

• Record Type: Journal Article
• Authors: Harrabi, K; Mekki, A; Bahlouli, H; Mathieu, P
• Is Part Of: Materials research express. Volume 8:Number 5(2021)
• Publication Date: 2021-05-26
• Subjects: hotspot -- nonequilibrium -- thin film -- critical current; Materials science -- Research -- Periodicals; Materials science -- Periodicals; 620.11
• DOI: 10.1088/2053-1591/ac017a
• Languages: English
• ISSNs: 2053-1591

Abstract

Abstract: We report on the creation of resistive states in NbTi superconducting filament on polished crystalline Al2 O3 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.