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

Description:

Article on phonon softening and high-pressure low-symmetry phases of cesium iodide.

Creator(s):
Creation Date: August 17, 1992
Partner(s):
UNT College of Arts and Sciences
Collection(s):
UNT Scholarly Works
Usage:
Total Uses: 25
Past 30 days: 3
Yesterday: 0
Creator (Author):
Buongiorno Nardelli, Marco

University of North Texas; Scuola Internazionale Superiore di Studî Avanzati

Creator (Author):
Baroni, Stefano

Scuola Internazionale Superiore di Studî Avanzati

Creator (Author):
Giannozzi, Paolo

Scuola Normale Superiore

Publisher Info:
Publisher Name: American Physical Society
Place of Publication: [College Park, Maryland]
Date(s):
  • Creation: August 17, 1992
Description:

Article on phonon softening and high-pressure low-symmetry phases of cesium iodide.

Degree:
Department: Chemistry
Department: Physics
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

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.

Physical Description:

5 p.

Language(s):
Subject(s):
Keyword(s): Landau theory | phase transitions | Brillouin zone
Source: Physical Review Letters, 1992, College Park: American Physical Society, pp. 1069-1073
Partner:
UNT College of Arts and Sciences
Collection:
UNT Scholarly Works
Identifier:
  • DOI: 10.1103/PhysRevLett.69.1069 |
  • ARK: ark:/67531/metadc270786
Resource Type: Article
Format: Text
Rights:
Access: Public
Citation:
Publication Title: Physical Review Letters
Volume: 69
Issue: 7
Page Start: 1069
Page End: 1073
Peer Reviewed: Yes