Multifractal scaling of flux penetration in the Iron-based Superconductor Ba(Fe$_{0.925}$Co$_{0.075}$)$_{2}$As$_2$ - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2013

Multifractal scaling of flux penetration in the Iron-based Superconductor Ba(Fe$_{0.925}$Co$_{0.075}$)$_{2}$As$_2$

Résumé

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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Dates et versions

hal-00716043 , version 1 (09-07-2012)
hal-00716043 , version 2 (11-11-2013)

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Mathieu Grisolia, Cornelis Jacominus van Der Beek, Yanina Fasano, Anne Forget, Dorothée Colson. Multifractal scaling of flux penetration in the Iron-based Superconductor Ba(Fe$_{0.925}$Co$_{0.075}$)$_{2}$As$_2$. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 87, pp.104517. ⟨10.1103/PhysRevB.87.104517⟩. ⟨hal-00716043v2⟩
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