Interplay of dendritic avalanches and gradual flux penetration in superconducting MgB2 films

Details Interplay of dendritic avalanches and gradual flux penetration in superconducting MgB2 films Interplay of dendritic avalanches and gradual flux penetration in superconducting MgB2 films

2002-12-17

arxiv.org/abs/cond-mat/0212404v1

Supercond. Sci. Technol. 16 (May 2003) 566-570

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures, submitted to Supercond. Sci. Technol

Scientific paper

10.1088/0953-2048/16/5/304

Magneto-optical imaging was used to study a zero-field-cooled MgB2 film at 9.6K where in a slowly increasing field the flux penetrates by abrupt formation of large dendritic structures. Simultaneously, a gradual flux penetration takes place, eventually covering the dendrites, and a detailed analysis of this process is reported. We find an anomalously high gradient of the flux density across a dendrite branch, and a peak value that decreases as the applied field goes up. This unexpected behaviour is reproduced by flux creep simulations based on the non-local field-current relation in the perpendicular geometry. The simulations also provide indirect evidence that flux dendrites are formed at an elevated local temperature, consistent with a thermo-magnetic mechanism of the instability

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