Magnetoresistance induced by low-field control of phase separation in La0.5Ca0.5MnO3

Details Magnetoresistance induced by low-field control of phase separation in La0.5Ca0.5MnO3 Magnetoresistance induced by low-field control of phase separation in La0.5Ca0.5MnO3

2000-08-04

arxiv.org/abs/cond-mat/0008080v3

Phys. Rev. B 63, 144419 (2001)

Physics

Condensed Matter

Materials Science

6 pages, 3 figures included. To appear in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.63.144419

The effect of low magnetic fields on the transport properties of a manganite compound with magnetic phase separation is studied. The different behavior obtained in samples of La0.5Ca0.5MnO3 related to the way in which the low field is applied is consistent with a picture of changes in the metallic fraction induced by the magnetic field in a field-cooled cycle. 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.

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