Weak ferromagnetism in LaMnO 3

V. Skumryev, F. Ott (), J. Coey, A. Anane, J. Renard, L. Pinsard-Gaudart and A. Revcolevschi

The European Physical Journal B: Condensed Matter and Complex Systems, 1999, vol. 11, issue 3, 401-406

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

Keywords: PACS. 75.25.+z Spin arrangements in magnetically ordered materials (including neutron and spin-polarized electron studies; synchrotron-source X-ray scattering; etc.); 75.50.Ee Antiferromagnetics; 75.40.Gb Dynamic properties (dynamic susceptibility; spin waves; spin diffusion; dynamic scaling; etc.) (search for similar items in EconPapers)
Date: 1999
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DOI: 10.1007/BF03219176

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