Magnetic-field induced ferromagnetism as the origin for the colossal magneto-resistance in La1.2 Sr1.8 Mn2 O7

Y. Shiotani, J. S. Gardner, J. L. Sarrao, Guo-Qing Zheng

Research output: Contribution to journalArticle

Abstract

We present a 139La NMR study on the colossal magneto-resistance (CMR) in double-layered manganese oxide La1.2 Sr1.8 Mn2 O7. Above the Curie temperature TC = 126 K, applying a magnetic field is found to induce a ferromagnetic order that persists up to T = 330 K. The critical field at which the induced magnetic moment is saturated agrees well with the field at which the CMR effect reaches to a maximum. Our results indicate that the CMR observed above TC is due to the field-induced ferromagnetism that produces a metallic state via the double exchange interaction.

Original languageEnglish
JournalJournal of Magnetism and Magnetic Materials
Volume310
Issue number2 SUPPL. PART 3
DOIs
Publication statusPublished - Mar 2007

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Keywords

  • CMR
  • Manganese oxide
  • NMR

ASJC Scopus subject areas

  • Condensed Matter Physics

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