Enhanced magnetoresistance in sintered granular manganite/insulator systems

16 August 1999

journal article
research article
Published by AIP Publishing in Applied Physics Letters

Vol. 75 (7) , 995-997
https://doi.org/10.1063/1.124577

Abstract

We report significant enhancements of magnetoresistance in granular ( La 0.67 Ca 0.33 MnO 3 ) x /( SrTiO 3 ) 1−x . The system exhibits a conduction threshold at x=x c ∼60%, around which magnetoresistance versus x has a maximum. The composition x c at which maximum enhancement in magnetoresistance is observed is the same at high (around 5 T) and at low (a few hundred Oersted) fields. The enhancement is consistent with the disorder-driven amplification of spin-dependent transport at the structural boundaries of the mixture.

Keywords

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