Phonon Softening and High-Pressure Low-Symmetry Phases of Cesium Iodide Metadata

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Title

  • Main Title Phonon Softening and High-Pressure Low-Symmetry Phases of Cesium Iodide

Creator

  • Author: Buongiorno Nardelli, Marco
    Creator Type: Personal
    Creator Info: University of North Texas; Scuola Internazionale Superiore di Studî Avanzati
  • Author: Baroni, Stefano
    Creator Type: Personal
    Creator Info: Scuola Internazionale Superiore di Studî Avanzati
  • Author: Giannozzi, Paolo
    Creator Type: Personal
    Creator Info: Scuola Normale Superiore

Publisher

  • Name: American Physical Society
    Place of Publication: [College Park, Maryland]

Date

  • Creation: 1992-08-17

Language

  • English

Description

  • Content Description: Article on phonon softening and high-pressure low-symmetry phases of cesium iodide.
  • Physical Description: 5 p.

Subject

  • Keyword: Landau theory
  • Keyword: phase transitions
  • Keyword: Brillouin zone

Source

  • Journal: Physical Review Letters, 1992, College Park: American Physical Society, pp. 1069-1073

Citation

  • Publication Title: Physical Review Letters
  • Volume: 69
  • Issue: 7
  • Page Start: 1069
  • Page End: 1073
  • Peer Reviewed: True

Collection

  • Name: UNT Scholarly Works
    Code: UNTSW

Institution

  • Name: UNT College of Arts and Sciences
    Code: UNTCAS

Rights

  • Rights Access: public

Resource Type

  • Article

Format

  • Text

Identifier

  • DOI: 10.1103/PhysRevLett.69.1069
  • Archival Resource Key: ark:/67531/metadc270786

Degree

  • Academic Department: Chemistry
  • Academic Department: Physics

Note

  • Display Note: Copyright 1992 American Physical Society. The following article appeared in Physical Review Letters, 69:7, http://link.aps.org/doi/10.1103/PhysRevLett.69.1069
  • Display Note: Abstract: The relative stability of various high-pressure phases of CsI is studied from first principles and analyzed using the Landau theory of phase transitions. We demonstrate that the cubic-to-orthorhombic transition recently observed to occur slightly below 20 GPa is driven by the softening of an acoustic phonon at the M point of the Brillouin zone. The coupling between this mode and anisotropic strain makes the transition slightly first order (with a volume variation of the order of 0.1%), and stabilizes the experimentally observed orthorhombic phase with respect to other competing symmetry-allowed structures.