Intergranular giant magnetoresistance in a spontaneously phase separated perovskite oxide

J. Wu, J. W. Lynn, C. J. Glinka, J. Burley, H. Zheng, J. F. Mitchell, C. Leighton

Research output: Contribution to journalArticlepeer-review

151 Scopus citations

Abstract

We present small-angle neutron scattering data proving that, on the insulating side of the metal-insulator transition, the doped perovskite cobaltite La1-xSrxCoO3 phase separates into ferromagnetic metallic clusters embedded in a nonferromagnetic matrix. This induces a hysteretic magnetoresistance, with temperature and field dependence characteristic of intergranular giant magnetoresistance (GMR). We argue that this system is a natural analog to the artificial structures fabricated by depositing nanoscale ferromagnetic particles in a metallic or insulating matrix; i.e., this material displays a GMR effect without the deliberate introduction of chemical interfaces.

Original languageEnglish (US)
Article number037201
JournalPhysical review letters
Volume94
Issue number3
DOIs
StatePublished - Jan 28 2005

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