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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5 p.

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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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The Scholarly Works Collection is home to materials from the University of North Texas community's research, creative, and scholarly activities and serves as UNT's Open Access Repository. It brings together articles, papers, artwork, music, research data, reports, presentations, and other scholarly and creative products representing the expertise in our university community.** Access to some items in this collection may be restricted.**

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  • August 17, 1992

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  • Jan. 21, 2014, 10:26 a.m.

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  • April 1, 2014, 4:41 p.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]. (digital.library.unt.edu/ark:/67531/metadc270786/: accessed February 28, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.