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

Abstract

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.

References in corpus (8)

• Modelling colossal magnetoresistance manganites
• Electron Glass Dynamics
• Coulomb Interactions and Nanoscale Electronic Inhomogeneities in Manganites
• Evidence for Charge Glass-like Behavior in Lightly Doped La_{2-x}Sr_{x}CuO_{4} at Low Temperatures
• Nonequilibrium 1/f Noise in Low-doped Manganite Single Crystals
• Colossal electroresistance in ferromagnetic insulating state of single crystal Nd${}_0.7$Pb${}_0.3$MnO${}_3$
• Non-Gaussian Noise in the In-Plane Transport of Lightly Doped La_{2-x}Sr_{x}CuO_4: Evidence for a Collective State of Charge Clusters
• Hot electron effects and non-linear transport in hole doped manganites

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• Metastable Resistivity States and Conductivity Fluctuations in Low-doped La${}_{1-x}$Ca${}_x$MnO${}_3$ Manganite Single Crystals
• Effect of spin-orbit interaction on the vortex dynamics in LaAlO${}_3$/SrTiO${}_3$ interfaces near the superconducting transition