Critical Behaviour of a Two-Dimensional Random Antiferromagnet: Rb2Mn0.5F4.

Jens Aage Als-Nielsen, R. J. Birgeneau, H. J. Guggenheim, G. Shirane

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    Abstract

    A neutron scattering study of the order parameter, correlation length and staggered susceptibility of the two-dimensional random antiferromagnet Rb2Mn0.5Ni0.5F4 is reported. The system is found to exhibit a well-defined phase transition with critical exponents identical to those of the isomorphous pure materials K2NiF4 and K2MnF4. Thus, in these systems, which have the asymptotic critical behaviour of the two-dimensional Ising model, randomness has no measurable effect on the phase-transition behaviour.
    Original languageEnglish
    JournalJOURNAL OF PHYSICS C-SOLID STATE PHYSICS
    Volume9
    Issue number5
    Pages (from-to)L121-L125
    ISSN0022-3719
    DOIs
    Publication statusPublished - 1976

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