  We report the observation of a large 1/f noise in the ferromagnetic
insulating state (FMI) of a hole doped manganite single crystal of
La0.80Ca0.20MnO3 which manifests hopping conductivity in presence of a Coulomb
gap. The temperature dependent noise magnitude shows a deep within the FMI
state, there is a sharp freeze out of the noise magnitude with temperature on
cooling. As the material enters the FMI state, the noise becomes non-Gaussian
as seen through probability density function and second spectra. It is proposed
to arise from charge fluctuations in a correlated glassy phase of the polaronic
carriers which develop in these systems as reported in recent simulation
studies.
