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DTSTART;VALUE=DATE:20250826T133000
DTEND;VALUE=DATE:20250826T133000
UID:18301@agenda.unifr.ch
DESCRIPTION:The problem of dissipation in superconductors is associated with variations in \ntime of the order parameter. In disordered wires, finite resistivity arises from the \ngeneration of phase slip centers where the order parameter oscillates between \nits maximum value and zero. These are manifested as discrete jumps in the \ncurrent-voltage (I-V) curve. This phenomenon is well-studied in quasi-1D \nsuperconductors, and possibilities for utilizing it to design quantum devices have \nalso been explored. We will discuss about the occurrence of a related \nphenomenon in superconducting films away from the 1D limit. In the case of \nquasi-1D systems, phase slips appear at weak points when the bias current \nexceeds the critical current. For a 2D film, this presents a different scenario since \na weak point is insufficient to impede supercurrent flow along the entire cross \nsection. We will present results of experiments to study this question focusing on \nconductance measurements of superconducting films. We have mapped the \ntransport properties in the intermediate bias regime, which reveals current \ncarrying steady states that are not accessible in simple current-biased \nmeasurements. The results show the existence of a complex distribution of \nnonequilibrium states which can be tracked on the current-voltage plane. We \nwill discuss about the fundamental aspects of this phenomenon and its interest \nin the design of non-linear superconducting networks.
SUMMARY:Onset of dissipation in superconductors with intermediate bias
CATEGORIES:Séminaire
LOCATION:PER 08\, 2.73\, Chemin du Musée 3\, 1700 Fribourg
URL;VALUE=URI:https://agenda.unifr.ch/e/fr/18301
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