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

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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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AB - 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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