Crystalline and magnetic ordering in the monoclinic phase of the layered perovskite PAMC

P. Harris, B. Lebech, N. Achiwa

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    Abstract

    A single-crystal elastic neutron scattering experiment between 4.2 and 115 K has been performed on the low-temperature monoclinic zeta phase of the layered perovskite bis(propylammonium) manganesetetrachloride (PAMC). The crystalline structure is commensurately modulated, with a modulation vector of 1/3b*, and below 39 K PAMC is an antiferromagnet with a small ferromagnetic component. The temperature dependence of the monoclinic angle alpha depends on the mosaicity of the crystal which increases with the number of 'cooling cycles'. The satellite reflections do not have any contribution from the magnetic ordering, but their intensity has abrupt changes that coincide with changes in either the nuclear or the magnetic ordering parameter. Magnetoelastic effects seem to influence the ordering of the crystal.
    Original languageEnglish
    JournalJournal of Physics: Condensed Matter
    Volume6
    Issue number21
    Pages (from-to)3899-3907
    ISSN0953-8984
    DOIs
    Publication statusPublished - 23 May 1994

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