In simply-connected, micron-size, aluminum thin-him structures in a pe
rpendicular magnetic held, resistance oscillations with a period close
to the quantum of magnetic flux through the area of the structure are
observed. The results obtained attest to the fact that when Abrikosov
vortices penetrate into a small-area superconducting film (mesoscopic
superconducting film), the film behaves similarly to a Little-Parks t
hin-film interferometer. (C) 1996 American Institute of Physics.