Search for Spontaneous Nucleation of Magnetic Flux During Rapid Cooling of YBCO films Through Tc

Details Search for Spontaneous Nucleation of Magnetic Flux During Rapid Cooling of YBCO films Through Tc Search for Spontaneous Nucleation of Magnetic Flux During Rapid Cooling of YBCO films Through Tc

1999-08-17

arxiv.org/abs/cond-mat/9908244v1

Physics

Condensed Matter

Superconductivity

Manuscript and 4 figures

Scientific paper

10.1103/PhysRevB.60.7595

We describe an experimental search for spontaneous formation of flux lines during a rapid quench of thin YBaCuO films through Tc. This effect is expected according to the Kibble-Zurek mechanism of a creation of topological defects of the order parameter during a symmetry breaking phase transition. Spontaneously formed vortices were previously observed in superfluid 3He, while a similar experiment in superfluid 4He gave negative results. Using a high Tc SQUID, we measured both the magnetic flux in the sample during a quench with a sensitivity of 20 phi-0/cm^2, and the field noise which one would expect from flux lines pinned in the film. The sensitivity was sufficient to detect spontaneous flux at a level corresponding to 10^(-3) of the prediction. Within our resolution, we saw no evidence for this effect.

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