Non-Gaussian resistance noise in the ferromagnetic insulating state of a hole doped manganite

Details Non-Gaussian resistance noise in the ferromagnetic insulating state of a hole doped manganite Non-Gaussian resistance noise in the ferromagnetic insulating state of a hole doped manganite

2011-05-25

arxiv.org/abs/1105.5079v1

Physics

Condensed Matter

Materials Science

Scientific paper

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.

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