Phonon softening and lattice melting at the ferroelastic phase transition in Na2CO3

M.J. Harris, D.F. McMorrow, K.W. Godfrey

    Research output: Contribution to journalJournal articleResearch

    Abstract

    We present the results of a detailed inelastic neutron scattering study of the dynamics of the ferroelastic phase transition in Na2Co3. The driving instability is a transverse acoustic mode that softens over a plane of wave vectors, resulting in a continuous loss of long-range order, in accord with theoretical predictions, At T-c a wide distribution of excitations is observed in the plane of critical wave vectors, similar to the dynamics of a liquid. Perpendicular to this plane the system possesses one-dimensional order.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume79
    Issue number24
    Pages (from-to)4846-4849
    ISSN0031-9007
    DOIs
    Publication statusPublished - 1997

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