Antiphase structures of an improper ferroelastic phase transition driven by an M5- zone boundary phonon in RAg1-xInx

Wenwu Cao, Avadh Saxena, Dorian M. Hatch

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Rare-earth alloys RAg1-xInx (where R=La, Ce, and Pr) are improper ferroelastic materials with the CsCl structure. A weakly first-order phase transition occurs with the softening of a zone-edge M5- mode that drives the material from a cubic phase to a tetragonal phase. Based on Ginzburg-Landau theory, we utilize the complete free-energy density, constructed from a six-dimensional primary order parameter (shuffle) that couples to strain, to study domain formation. The model allows the study of complex antiphase structures that appear in this cubic-to-tetragonal phase transition. With the help of numerical techniques, the order-parameter profiles across antiphase boundaries of different orientations and their temperature dependence are calculated. We find a single set of two coupled dimensionless governing equations, which are applicable to order-parameter profiles across all antiphase boundaries for this transition.

Original languageEnglish (US)
Article number024106
Pages (from-to)241061-2410612
Number of pages2169552
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number2
DOIs
StatePublished - Jan 1 2001

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antiphase boundaries
Phase transitions
Rare earth alloys
ferroelastic materials
rare earth alloys
Free energy
profiles
softening
flux density
free energy
temperature dependence
Temperature
cesium chloride

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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Antiphase structures of an improper ferroelastic phase transition driven by an M5- zone boundary phonon in RAg1-xInx. / Cao, Wenwu; Saxena, Avadh; M. Hatch, Dorian.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 64, No. 2, 024106, 01.01.2001, p. 241061-2410612.

Research output: Contribution to journalArticle

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