We have observed spontaneous fluxoid generation in thin film rings of the amorphous superconductor Mo3Si, cooled through the normal-superconducting transition, as a function of quench rate and externally applied magnetic field, using a variable sample temperature scanning SQUID microscope. Our results can be explained using a model of freeze-out of thermally activated fluxoids, mediated by the transport of bulk vortices across the ring walls. This mechanism is complementary to a mechanism proposed by Kibble and Zurek, which only relies on causality to produce a freeze-out of order parameter fluctuations
Evidence for Thermally Activated Spontaneous Fluxoid Formation in Superconducting Thin-Film Rings / Kirtley, J. R.; Tsuei, C. C.; Tafuri, Francesco. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 90:(2003), pp. 257001-257004. [10.1103/PhysRevLett.90.257001]
Evidence for Thermally Activated Spontaneous Fluxoid Formation in Superconducting Thin-Film Rings
Tafuri, Francesco
2003
Abstract
We have observed spontaneous fluxoid generation in thin film rings of the amorphous superconductor Mo3Si, cooled through the normal-superconducting transition, as a function of quench rate and externally applied magnetic field, using a variable sample temperature scanning SQUID microscope. Our results can be explained using a model of freeze-out of thermally activated fluxoids, mediated by the transport of bulk vortices across the ring walls. This mechanism is complementary to a mechanism proposed by Kibble and Zurek, which only relies on causality to produce a freeze-out of order parameter fluctuations| File | Dimensione | Formato | |
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