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

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

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Buongiorno Nardelli, Marco; Baroni, Stefano & Giannozzi, Paolo August 17, 1992.

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

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5 p.

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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

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.

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

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

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  • August 17, 1992

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  • Jan. 21, 2014, 10:26 a.m.

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Buongiorno Nardelli, Marco; Baroni, Stefano & Giannozzi, Paolo. Phonon Softening and High-Pressure Low-Symmetry Phases of Cesium Iodide, article, August 17, 1992; [College Park, Maryland]. (https://digital.library.unt.edu/ark:/67531/metadc270786/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT College of Arts and Sciences.

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