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

研究成果査読

抄録

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.

本文言語English
ページ(範囲)e661-e663
ジャーナルJournal of Magnetism and Magnetic Materials
310
2 SUPPL. PART 3
DOI
出版ステータスPublished - 3月 2007

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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