Dendritic flux patterns in MgB2 films

Details Dendritic flux patterns in MgB2 films Dendritic flux patterns in MgB2 films

2001-08-05

arxiv.org/abs/cond-mat/0108092v1

Supercond. Sci. Technol. 14, 726-728 (2001)

Physics

Condensed Matter

Superconductivity

Accepted to Supercond. Sci. Technol

Scientific paper

10.1088/0953-2048/14/9/319

Magneto-opitcal studies of a c-oriented epitaxial MgB2 film with critical current density 10^7 A/cm^2 demonstrate a breakdown of the critical state at temperatures below 10 K [cond-mat/0104113]. Instead of conventional uniform and gradual flux penetration in an applied magnetic field, we observe an abrupt invasion of complex dendritic structures. When the applied field subsequently decreases, similar dendritic structures of the return flux penetrate the film. The static and dynamic properties of the dendrites are discussed.

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