Mathieu Grisolia, Cornelis J. van der Beek, Anne Forget, Dorothee Colson
The penetration of magnetic flux fronts in the optimally doped iron based superconductor Ba(Fe$_{0.925}$Co$_{0.075}$)$_{2}$As$_2$ is studied by means of high resolution magneto-optic imaging. The analysis of roughening and growth of the magnetic flux front reveals anomalous scaling properties. While higher-order spatial correlation functions reveal multifractal behavior for the roughening, the usual Kardar-Parisi-Zhang growth exponent is found. Both exponents are found to independent of temperature. We propose a scenario for vortex penetration based on 2D percolation and cluster aggregation in an inhomogeneously disordered superconductor.
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http://arxiv.org/abs/1207.2068
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