A Soft Acoustic Mode in the Ferroelastic Phase Transition of LaNbO4

Kazuhiro Hara, Akira Sakai, Toshirou Yagi

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

An anisotropic softening of the acoustic mode in the ferroelastic phase transition of LaNbO4 has been observed by the Brillouin scattering experiment. The transverse mode propagating along a direction deviated from the crystal axis by 23° in the flZ)-plane shows a complete softening at the transition temperature Tq. The direction is parallel or normal to the ferroelastic domain boundary as predicted by the phenomenological analysis of the phase transition from 4/m to 2/m symmetry. The temperature dependence of the elastic susceptibility is well described by the classical indices y=y'=1 in both phases, suggesting a typical proper ferroelastic transition.

Original languageEnglish
Pages (from-to)1168-1172
Number of pages5
Journaljournal of the physical society of japan
Volume54
Issue number3
DOIs
Publication statusPublished - Jan 1 1985

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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