Instability driven formation of domains in the intermediate state of type-I superconductors

Details Instability driven formation of domains in the intermediate state of type-I superconductors Instability driven formation of domains in the intermediate state of type-I superconductors

2006-03-30

arxiv.org/abs/cond-mat/0603805v1

Europhysics Letters 75 (2006) 482

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1016/j.jmmm.2005.10.042

The formation of normal-state domains in type-I superconducting indium films is investigated using the high resolution magneto-optical imaging technique. The observed patterns consist of coexisting circular and lamellar normal-phase domains surrounded by the superconducting phase. The distribution of domain surface areas is found to exhibit a threshold, above which only the lamellar shape is observed. We show that this threshold coincides with the predicted critical surface area for the elongation instability of the circular shape. The partition of the normal phase into circular and lamellar domains is determined by the combined effects of the elongation instability and the penetration of magnetic flux by bursts at the early stage of pattern formation. It is not governed by mutual interactions between domains, as usually assumed for self-organized systems.

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