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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2016

Crossing fields in thin films of isotropic superconductors

Résumé

We study interactions of perpendicular and longitudinal magnetic fields in niobium films of different thickness in a wide range of temperatures below the superconducting transition temperature (T C). In 100-nm Nb film at all temperatures the longitudinal field H || practically does not influence the dynamics of the normal flux. However, in 200-nm Nb film, a considerable anisotropy in the vortex motion is found with advanced propagation of the normal flux along H || at T > T C /2 and the preferential jumpwise growth of the thermomagnetic flux dendrites across H || at T < T C. Appearance of the in-plane vortices and their cutting reconnection with tilted vortices induced by the normal field H ⊥ is the reason for the observed anisotropy in the thicker film. Absence of the in-plane vortices and much smaller tilt of vortices generated by H ⊥ explain the isotropic normal flux dynamics in the thinner film. Our results open an alternative way of manipulating both slow vortex motion and fast thermomagnetic avalanches.
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Dates et versions

hal-01428849 , version 1 (06-01-2017)

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Paternité - Partage selon les Conditions Initiales

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V. K. Vlasko-Vlasov, F. Colauto, Alexandre I. Buzdin, D. Carmo, A. M. H. Andrade, et al.. Crossing fields in thin films of isotropic superconductors. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2016, 94 (18), pp.184502. ⟨10.1103/PhysRevB.94.184502⟩. ⟨hal-01428849⟩

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