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High resolution diffraction and small angle scattering neutron investigations of LaCo 0.5 Mn 0.5 O 3+ δ : effect of oxygen content

Author

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  • D. V. Karpinsky
  • I. O. Troyanchuk
  • A. P. Sazonov
  • O. A. Savelieva
  • A. Heinemann

Abstract

We have investigated LaCo 0.5 Mn 0.5 O 3+ δ compounds with different oxygen content by means of magnetization, high resolution and small-angle neutron diffraction measurements. Oxygen content decrease down to stoichiometric composition leads to an essential increase of T C and magnetic moment while Co/Mn ionic ordering degree is kept almost constant. It is assumed that upon oxygen reduction Co 3+ ions change their valence state down to 2+ one that leads to dominating of Co 2+ -Mn 4+ ferromagnetic interactions as well as T C increase. Magnetic properties can be explained in terms of coexistence of long-range ferromagnetic order and short-range clusters with antiferromagnetic interactions prevailing. Size distribution of the mentioned short-range magnetic inhomogeneities is rather mild within the samples but it is strongly temperature dependent. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Suggested Citation

  • D. V. Karpinsky & I. O. Troyanchuk & A. P. Sazonov & O. A. Savelieva & A. Heinemann, 2007. "High resolution diffraction and small angle scattering neutron investigations of LaCo 0.5 Mn 0.5 O 3+ δ : effect of oxygen content," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 60(3), pages 273-279, December.
    • Handle: RePEc:spr:eurphb:v:60:y:2007:i:3:p:273-279
    DOI: 10.1140/epjb/e2007-00349-2
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