Neutron depolarization study of a high-T_c epitaxial thin film

Neutron depolarization measurements on an epitaxial thin film of YBaCuO superconducting material are reported and interpreted on the basis of formation of an Abrikosov flux lattice by field cooling. The temperature and field dependences of this effect have been measured and suggest that the technique may be useful in obtaining information on flux lattice stability and pinning forces. © 1991.