Magnetic field distribution around flux-lines in YBa2Cu3O7 superconducting thin films in a parallel field

The magnetic field distribution inside thin YBa2Cu3O7 films in the mixed state was studied by polarized neutron reflection. The external held was parallel to the film surface, the thickness of the films was smaller or about equal to the London penetration depth lambda. The obtained scattering length density distribution suggests that the magnetic field dependence around a flux-line is changed through the restricted geometry of the thin film. The decay of the magnetic field around a flux-line is not anymore governed by lambda but by the thickness of the him. (C) 2000 Elsevier Science B.V. AU rights reserved.