Spin-polarized intergrain tunneling in La2/3Sr1/3MnO3

H. Y. Hwang, S. W. Cheong, N. P. Ong, B. Batlogg

Research output: Contribution to journalArticle

1768 Scopus citations

Abstract

The magnetoresistance (MR) and the field dependent magnetization have been systematically examined in the low temperature ferromagnetic metallic state of single crystal and polycrystalline La2/3Sr1/3MnO3.We find that the intrinsic negative MR in single crystal is due to the suppression of spin fluctuations, and magnetic domain boundaries do not dominate the scattering process. In contrast, we demonstrate that the MR in the polycrystalline samples exhibits two distinct regions: large MR at low fields dominated by spin-polarized tunneling between grains and high field MR which is remarkably temperature independent from 5 to 280 K.

Original languageEnglish (US)
Pages (from-to)2041-2044
Number of pages4
JournalPhysical review letters
Volume77
Issue number10
DOIs
StatePublished - Jan 1 1996

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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