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Development of the magnetic excitations of charge-stripe ordered La2−x Sr x NiO4 on doping towards checkerboard charge order

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Abstract

The magnetic excitation spectrums of charge stripe ordered La2−x Sr x NiO4 x = 0.45 and x = 0.4 were studied by inelastic neutron scattering. We found the magnetic excitation spectrum of x = 0.45 from the ordered Ni2+ S = 1 spins to match that of checkerboard charge ordered La1.5Sr0.5NiO4. The distinctive asymmetry in the magnetic excitations above 40meV was observed for both doping levels, but an additional ferromagnetic mode was observed in x = 0.45 and not in the x = 0.4. We discuss the origin of crossover in the excitation spectrum between x = 0.45 and x = 0.4 with respect to discommensurations in the charge stripe structure.

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Authors and Affiliations

  1. Laboratory for Quantum Magnetism, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland

    P. G. Freeman

  2. Helmholtz-Zentrum Berlin n für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, D-14109, Berlin, Germany

    P. G. Freeman

  3. Institut Laue-Langevin, BP 156, 38042, Grenoble Cedex 9, France

    P. G. Freeman

  4. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, UK

    S. R. Giblin

  5. Cardiff School of Physics and Astronomy, Cardiff University, Queens Buildings, The Parade, Cardiff, CF24 3AA, UK

    S. R. Giblin

  6. Institut für Physikalische Chemie, Universität Göttingen, Tammanstrasse 6, 37077, Göttingen, Germany

    K. Hradil

  7. Technische University Wien, Karlsplatz 13, 1040, Vienna, Austria

    K. Hradil

  8. Bragg Institute, ANSTO, New Illawarra Road, Lucas Heights, NSW, Australia

    R. A. Mole

  9. FRM II, Lichtenbergstraße, 1, 85747, Garching, Germany

    R. A. Mole

  10. Department of Physics, University of Oxford, Oxford, OX1 3PU, UK

    D. Prabhakaran

Authors
  1. P. G. Freeman
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  2. S. R. Giblin
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  3. K. Hradil
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  4. R. A. Mole
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  5. D. Prabhakaran
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Corresponding author

Correspondence to P. G. Freeman.

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Freeman, P.G., Giblin, S.R., Hradil, K. et al. Development of the magnetic excitations of charge-stripe ordered La2−x Sr x NiO4 on doping towards checkerboard charge order. Journal of the Korean Physical Society 62, 1453–1457 (2013). https://doi.org/10.3938/jkps.62.1453

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  • DOI: https://doi.org/10.3938/jkps.62.1453

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