Hot electron effects and non-linear transport in hole doped manganites

TL;DR

This paper demonstrates that hot electron effects cause strong non-linear transport phenomena in ferromagnetic insulating manganites, explaining colossal electroresistance and resistance switching through electron-lattice decoupling and heating.

Contribution

It introduces a hot electron effect model for non-linear transport in manganites and validates it with experimental parameters and time dependence studies.

Findings

Hot electron heating explains non-linear transport phenomena.

FMI state is an insulator with a Coulomb gap.

Electron-lattice decoupling occurs at high input power.

Abstract

We show that strong non--linear electron transport in the ferromagnetic insulating (FMI) state of manganites, responsible for phenomena such as colossal electroresistance and current induced resistance switching, can occur due to a hot electron effect. In the FMI state, which we show is an insulator with a Coulomb gap, the temperature of the electron and lattice baths can decouple at high input power levels, leading to heating of the electron bath. Parameters of the hot electron effect model were independently determined via time dependence experiments and are in good agreement with the experimental values.