Applied Physics A

, Volume 74, Supplement 1, pp s1734–s1736 | Cite as

Crystal and magnetic structures of new layered oxides A2GaMnO5+y (A=Ca, Sr)

  • D.V. Sheptyakov
  • A.M. Abakumov
  • E.V. Antipov
  • A.M. Balagurov
  • S.J.L. Billinge
  • P. Fischer
  • L. Keller
  • M.V. Lobanov
  • B.Ph. Pavlyuk
  • V.Yu. Pomjakushin
  • M.G. Rozova

Abstract.

Crystal and magnetic structures of new complex manganese oxides A2GaMnO5+y (A=Ca,Sr) were studied by neutron diffraction. Being perovskite-type derivatives, their crystal structures belong to a brownmillerite type and consist of alternating (CaO), (MnO2), (CaO) and (GaO) or (GaO1+x) layers. At temperatures between ≈(100-200) K, these compounds undergo transitions into antiferromagnetic states. The magnetic ordering type depends on the compositions. The Mn magnetic moments are aligned in opposite directions within the MnO2 layer, and the coupling between magnetic moments lying in the adjacent MnO2 layers is, for example, antiferromagnetic for the reduced, and ferromagnetic for the oxidized Sr-containing compound Sr2GaMnO5 and Sr2GaMnO5.52 compositions, respectively.

PACS: 61.12.Ld; 75.25. 

Copyright information

© Springer-Verlag 2002

Authors and Affiliations

  • D.V. Sheptyakov
    • 1
  • A.M. Abakumov
    • 2
  • E.V. Antipov
    • 2
  • A.M. Balagurov
    • 3
  • S.J.L. Billinge
    • 4
  • P. Fischer
    • 1
  • L. Keller
    • 1
  • M.V. Lobanov
    • 2
  • B.Ph. Pavlyuk
    • 2
  • V.Yu. Pomjakushin
    • 3
  • M.G. Rozova
    • 2
  1. 1.Laboratory for Neutron Scattering, ETH Zürich & PSI Villigen, 5232 Villigen, PSI, SwitzerlandCH
  2. 2.Department of Chemistry, Moscow State University, Moscow 119899, RussiaRU
  3. 3.Frank Laboratory of Neutron Physics, JINR, 141980 Dubna, RussiaRU
  4. 4.Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48824-1116, USAUS

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