Phys. Rev. B 56, 8138–8142 (1997)Tunnel-type giant magnetoresistance in the granular perovskite La0.85Sr0.15MnO3Received 23 August 1996; revised 11 March 1997; published in the issue dated 1 October 1997 The grain-size-dependent transport properties in the granular perovskite La0.85Sr0.15MnO3 have been investigated. A giant magnetoresistance (GMR) effect, similar to that observed in granular transition metals, and a crystal intrinsic colossal magnetoresistance (CMR) have been simultaneously observed. With grain growth, the GMR effect gradually weakens and the intrinsic CMR effect becomes prominent in the present granular system. A resistivity formula originating from interfacial tunneling is obtained and the theoretical calculation is found to be in good agreement with our experimental results. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.56.8138
DOI:
10.1103/PhysRevB.56.8138
PACS:
75.50.-y, 75.80.+q
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