Magnetic flux distribution inside an YBa2Cu3O7 superconducting thin film in the mixed state

The study with polarized neutron reflection showed the spatially resolved n uclear and magnetic structure in a high-temperature superconducting (HTc) f ilm of YBa2Cu3O7 in the mixed state in an external field parallel to its su rface. The obtained magnetic flux profile is composed of the penetrating Me issner field and the Bur-line rows. The flux-line rows show good linear arr angements. A local critical magnetization inside the HTc film was determine d. The total magnetization exhibits flux-line row transitions and increases in average with increasing external field due to the surface barrier and t he flux-line interaction. (C) 1999 Elsevier Science B.V. All rights reserve d.