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Roles of Orbitals in Transition Metal Oxides

  • Y. Endoh
  • K. Hirota
  • Y. Murakami
  • H. Nojiri
  • S. Ishihara
  • S. Maekawa
  • H. Kimura
  • T. Fukuda
  • N. Okamoto
Conference paper
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 125)

Abstract

Neutron and synchrotron x-ray scattering experiments with additional bulk measurements such as the magnetization, and resitivity under high magnetic field have been performed from single crystals of the colossal magneto resistance (CMR) manganese oxides of Lal−xSrxMn03. Systematic experimental investigations show decisively that the complicated phase diagram around x ≈ 0.12 has been comprehended as the first order phase transition from metal to insulator applying magnetic field driven by the orbital order. The ferromagnetic insulting phase is not originated by the Jahn Teller interaction but is by the electron correlation, since the crystal symmetry is pseudo cubic. The novel CMR mechanism is proposed based on the present experimental investigations.

Keywords

Manganese Oxide Spin Dynamic Colossal Magneto Resistance Orbital Order Anomalous Scattering 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • Y. Endoh
    • 1
  • K. Hirota
    • 1
  • Y. Murakami
    • 2
  • H. Nojiri
    • 3
  • S. Ishihara
    • 3
  • S. Maekawa
    • 3
  • H. Kimura
    • 1
  • T. Fukuda
    • 4
  • N. Okamoto
    • 3
  1. 1.Department of Physics, Graduate School of Science, CRESTTohoku UniversityAoba-ku, SendaiJapan
  2. 2.Photon Factory, KEK , CRESTInstitute of Materials Structure ScienceTsukuba, IbarakiJapan
  3. 3.Institute of Material Research, CRESTTohoku UniversityAoba-ku, SendaiJapan
  4. 4.Japan Atomic Energy Research InstituteSPring8Mihara, Mikazuki-cho, Sayo-gun, HyogoJapan

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