Magnetization and magnetotransport properties of a discontinuous La0.7Ca0.3MnO3 film on LaAlO3 are presented. The sample shows transport characteristics of a granular ferromagnet with an extraordinarily large magnetoresistance. The data are successfully interpreted within a model of spin-dependent tunneling between grains taking into account magnetic intergrain correlation effects.
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M. Ziese (2002) studied this question.
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