  Reproducible, sample-specific magnetoresistance fluctuations (magnetic
fingerprints) have been observed experimentally in the low-temperature part of
the superconducting transition regime of disordered superconducting
Au_0.7In_0.3 cylinders. The amplitude of the fluctuation was found to exceed
that of the universal conductance fluctuation in normal metals by several
orders of magnitude. The physical origin of these observations is discussed in
the context of mesoscopic fluctuations of the superconducting condensation
energy in disordered superconductors.
