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

Fingerprint

Colossal magnetoresistance
Ferromagnetism
ferromagnetism
Magnetic fields
magnetic fields
Manganese oxide
manganese oxides
Exchange interactions
Curie temperature
Magnetic moments
magnetic moments
Nuclear magnetic resonance
nuclear magnetic resonance
interactions

Keywords

  • CMR
  • Manganese oxide
  • NMR

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Magnetic-field induced ferromagnetism as the origin for the colossal magneto-resistance in La1.2 Sr1.8 Mn2 O7. / Shiotani, Y.; Gardner, J. S.; Sarrao, J. L.; Zheng, Guo-Qing.

In: Journal of Magnetism and Magnetic Materials, Vol. 310, No. 2 SUPPL. PART 3, 03.2007.

Research output: Contribution to journalArticle

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AB - 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.

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