Electromagnetic interaction of vortices in layered superconducting structures

Alexandre I. Buzdin (1) , Denis Feinberg (2)

1 Department of Physics, Moscow State Pedagogical University
2 LEPES - Laboratoire d'Etudes des Propriétés Electroniques des Solides

A multilayered superconducting system with a purely electromagnetic coupling between layers is considered. A general formula is derived for the energy of an arbitrary configuration of point vortices localized in the layers. It is shown that the interaction energy of a vortex and an antivortex located on the same layer depends logarithmically on their distance for large distances. The structure of a vortex line in perpendicular fields is also considered. Two different regimes appear, depending on the ratio of the interlayer distance d to the effective one-layer screening length λ eff = λ 2L/ d0 where λL is the London screening length in the layers and do the layer thickness. Due to the temperature dependence of λL, the behaviour of the first critical field H c1 is expected to show a crossover below Tc.

Mots clés: superconducting thin films; flux line lattice; superconducting critical field

Domaines: Articles anciens

Alexandre I. Buzdin, Denis Feinberg. Electromagnetic interaction of vortices in layered superconducting structures. Journal de Physique, 1990, 51 (17), pp.1971-1978. ⟨10.1051/jphys:0199000510170197100⟩. ⟨jpa-00212502⟩