Temporal Evolution of Normal Hot Spots in Current-Driven Superconducting Films View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2001-04

AUTHORS

Kh. Harrabi, N. Cheenne, Vu Dinh Lam, F.-R. Ladan, J.-P. Maneval

ABSTRACT

In addition to the critical current Ic (T), which generates Phase-Slip Centers (PSCs), thin superconducting films possess a well-defined second limiting current Ih, or current intensity able to maintain a preestablished hot spot. By pulsing step functions of the current and monitoring the voltage response on the nanosecond scale, we have determined (T ↔ Ic) and (T ↔ Ih). From a dynamic study of the two main modes of dissipation in YBCO and Nb films, it is concluded that PSCs are stable structures in current-biased bridges. In contrast, hot spots grow at a constant rate of a few tens of meters per second, determined by the thermal diffusivity of the material and by its bolometric response time. On reducing the current from Ih, the so-called healing length, or minimum normal length, was found, of the order of 0.2 μm in YBCO and 2 μm in Nb. In summary, the experiment provides three independent measurements (PSC nucleation time, velocity of growth, and minimum length) for only two parameters (D and τ). More... »

PAGES

325-329

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1023/a:1007892825488

DOI

http://dx.doi.org/10.1023/a:1007892825488

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1042011447


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