Isomorphous phase transition of 1,2,4,5-tetrabromobenzene jumping crystals studied by Brillouin light scattering

Jae Hyeon Ko, Kwang Sei Lee, Subash Chandra Sahoo, Pance Naumov

    Research output: Contribution to journalArticle

    Abstract

    The isomorphous phase transition of 1,2,4,5-tetrabromobenzene (TBB) jumping crystals was studied by Brillouin light scattering. The temperature dependence of the sound velocity and the corresponding elastic constants of three acoustic modes propagating along the [110] direction were measured as a function of temperature covering the β-γ phase transition temperature for the first time. All three elastic constants showed discontinuities at the jumping transition temperature with a large thermal hysteresis. While the longitudinal and one of the two transverse acoustic modes did not exhibit any appreciable changes in both the β and the γ phase, the lowest transverse acoustic mode showed substantial softening on approaching the jumping transition from both phases. This clearly showed that the jumping transition of this molecular crystal is driven by the elastic instability and that large intermolecular anharmonic interaction is associated with the molecular motions in the (110) plane.

    Original languageEnglish (US)
    Pages (from-to)46-50
    Number of pages5
    JournalSolid State Communications
    Volume173
    DOIs
    StatePublished - Jan 1 2013

    Fingerprint

    Brillouin scattering
    Elastic constants
    Light scattering
    Superconducting transition temperature
    light scattering
    Phase transitions
    Molecular crystals
    Crystals
    acoustics
    Acoustic wave velocity
    elastic properties
    transition temperature
    crystals
    Hysteresis
    acoustic velocity
    softening
    Temperature
    discontinuity
    coverings
    hysteresis

    Keywords

    • C. Crystal structure and symmetry
    • D. Phase transitions
    • D. Phonons
    • E. Inelastic light scattering

    ASJC Scopus subject areas

    • Chemistry(all)
    • Condensed Matter Physics
    • Materials Chemistry

    Cite this

    Isomorphous phase transition of 1,2,4,5-tetrabromobenzene jumping crystals studied by Brillouin light scattering. / Ko, Jae Hyeon; Lee, Kwang Sei; Chandra Sahoo, Subash; Naumov, Pance.

    In: Solid State Communications, Vol. 173, 01.01.2013, p. 46-50.

    Research output: Contribution to journalArticle

    Ko, Jae Hyeon ; Lee, Kwang Sei ; Chandra Sahoo, Subash ; Naumov, Pance. / Isomorphous phase transition of 1,2,4,5-tetrabromobenzene jumping crystals studied by Brillouin light scattering. In: Solid State Communications. 2013 ; Vol. 173. pp. 46-50.
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    abstract = "The isomorphous phase transition of 1,2,4,5-tetrabromobenzene (TBB) jumping crystals was studied by Brillouin light scattering. The temperature dependence of the sound velocity and the corresponding elastic constants of three acoustic modes propagating along the [110] direction were measured as a function of temperature covering the β-γ phase transition temperature for the first time. All three elastic constants showed discontinuities at the jumping transition temperature with a large thermal hysteresis. While the longitudinal and one of the two transverse acoustic modes did not exhibit any appreciable changes in both the β and the γ phase, the lowest transverse acoustic mode showed substantial softening on approaching the jumping transition from both phases. This clearly showed that the jumping transition of this molecular crystal is driven by the elastic instability and that large intermolecular anharmonic interaction is associated with the molecular motions in the (110) plane.",
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