Bulletin of the American Physical Society
APS March Meeting 2022
Volume 67, Number 3
Monday–Friday, March 14–18, 2022; Chicago
Session S61: Superconductivity: Thermodynamic, Transport, Electronic
8:00 AM–11:00 AM,
Thursday, March 17, 2022
Room: Hyatt Regency Hotel -Field
Sponsoring Unit: DCMP
Chair: Hyowon Park, University of Illinois Chicago
Abstract: S61.00015 : Dissipative States Induced by Current Pulse in NbTi Superconducting Filaments
10:48 AM–11:00 AM
K. Harrabi1 , A. Mekki1 , H. Bahlouli1
1Physics Department, King Fahd University of Petroleum and Minerals, 1261 Dhahran, Saudi Arabia.
We investigated the induced non-equilibrium states in superconducting NbTi wires using short electrical current pulse technique. The energy dissipation occurs once the current pulse amplitude exceeds the depairing current (Ic). For a wire with a demension larger than the coherence length (ζ), vortex and antivortex trains are generated and then flow in transverse direction to the applied current and opposite to each other so that they annihilate at the center of the filament to create phase slip lines. This is considered as a metastable state in which the order parameter value oscillates between zero and one (a mixture of normal and superconducting states). A pure normal dissipative local area referred to as a hotspot appears in the filament where the total collapse of the superductivity occurs. As a result, a voltage appears after certain delay time td marking the initiation of energy dissipation. The thermal relaxation time was extracted from fitting the experimental data with the Time-Dependent Ginzburg-Landau (TDGL) theory due to M. Tinkham at 4 K.
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