A Soft Acoustic Mode in the Ferroelastic Phase Transition of LaNbO4

Kazuhiro Hara, Akira Sakai, Toshirou Yagi

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23 Citations (Scopus)


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
Issue number3
Publication statusPublished - 1985
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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