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Weak ferromagnetism in LaMnO 3

Author

Listed:
  • V. Skumryev
  • F. Ott
  • J. Coey
  • A. Anane
  • J. Renard
  • L. Pinsard-Gaudart
  • A. Revcolevschi

Abstract

The magnetic properties of (La 1 − x Sr x )MnO 3 crystals have been studied. The ac susceptibility χ=χ′ + iχ″ has been measured at frequencies ranging from 10 Hz to 1 000 Hz. The x=0.25 crystal shows a typical ferromagnetic behaviour with a dimensionless SI susceptibility of 6 below T c =350 K limited by the demagnetizing field. Both x=0 and x=0.06 crystals show very sharp peaks in χ′ and χ″ at the Néel points, 139 K and 135 K respectively. This is quite unlike the usual behaviour of an antiferromagnet. Magnetization measurements on an untwinned single crystal of LaMnO 3 show a weak moment of 0.18 μ B at 4.2 K which is directed along the c axis. The origin of this canted antiferromagnetic structure is discussed in terms of anisotropy and of Dzyaloshinskii-Moriya interaction. It is concluded that anistropy is insufficient to explain the canted antiferromagnetism. Copyright Società Italiana di Fisica, Springer-Verlag 1999

Suggested Citation

  • V. Skumryev & F. Ott & J. Coey & A. Anane & J. Renard & L. Pinsard-Gaudart & A. Revcolevschi, 1999. "Weak ferromagnetism in LaMnO 3," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 11(3), pages 401-406, October.
    • Handle: RePEc:spr:eurphb:v:11:y:1999:i:3:p:401-406:10.1007/bf03219176
    DOI: 10.1007/BF03219176
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