Magnetic Field Control of Phase Separation Drives the Low Field Colossal Magnetoresistance in Mixed-valent Manganites
Abstract
The effect of low magnetic fields on the transport properties of phase separated manganites is studied. The different behavior obtained in samples of La0.5Ca0.5MnO3 related to the way in which the field is applied is consistent with a picture of changes in the metallic fraction induced by the magnetic field in a field cool cycle. Taking this fact, and using a simple model of conduction through a binary mixture, the interrelation between magnetoresistance, metallic fraction and percolation temperature is accounted for. A new physical coefficient relating magnetic field and metallic fraction emerges as the relevant parameter in the description of phase separated manganites.Keywords
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