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Orbital Order and Orbital Fluctuations in Colossal Magnetoresistive Manganites. An Investigation with 55Mn and 139La NMR

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Magnetic Resonance in Colloid and Interface Science

Part of the book series: NATO Science Series ((NAII,volume 76))

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Abstract

55Mn and 139La NMR techniques are shown to be an excellent tool for detecting changes in the local electronic properties of colossal magnetoresistance manganites. Based on this we discuss the possibility of detecting orbital ordering in ferromagnetic La1-xCaxMnO3 (0.20≤x<0.5). We also provide evidence about the formation of an unusual kind of phase separation in the low temperature regime of the ferromagnetic conductive regime of the magnetic phase diagram for x≥0.25. Specifically, we show that by lowering temperature, an extra NMR signal is formed in the ferromagnetic conductive phase, which originates from regions with extremely small magnetic anisotropy, possibly produced by strong orbital fluctuations.

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Authors and Affiliations

  1. Institute of Materials Science, NCSR Demokritos, 153 10 Aghia Paraskevi, Athens, Greece

    G. Papavassiliou, M. Belesi & M. Fardis

  2. Institut de Physique Exprimentale, EPFL-PH-Ecublens, 1015, Lausanne, Switzerland

    C. Dimitropoulos

  3. Department of Physics, Indian Institute of Technology, Madras, Chennai, 600036, India

    M. Pattabiraman & G. Rangarajan

Authors
  1. G. Papavassiliou
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  2. M. Belesi
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  3. M. Fardis
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  4. C. Dimitropoulos
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  5. M. Pattabiraman
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  6. G. Rangarajan
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Editor information

Editors and Affiliations

  1. Laboratoire de Chimie des Surfaces, Université Pierre et Marie Curie, Paris, France

    Jacques Fraissard

  2. Russian Academy of Sciences, Boreskov Institute of Catalysis, Novosibirsk, Russia

    Olga Lapina

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© 2002 Springer Science+Business Media Dordrecht

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Papavassiliou, G., Belesi, M., Fardis, M., Dimitropoulos, C., Pattabiraman, M., Rangarajan, G. (2002). Orbital Order and Orbital Fluctuations in Colossal Magnetoresistive Manganites. An Investigation with 55Mn and 139La NMR. In: Fraissard, J., Lapina, O. (eds) Magnetic Resonance in Colloid and Interface Science. NATO Science Series, vol 76. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-0534-0_18

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  • DOI: https://doi.org/10.1007/978-94-010-0534-0_18

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-1-4020-0787-3

  • Online ISBN: 978-94-010-0534-0

  • eBook Packages: Springer Book Archive

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