Critical behaviour of the Raman frequency shifts in the vicinity of the lambda-phase transition in NH4Br

Yurtseven H., Unlu Z.

HIGH TEMPERATURE MATERIALS AND PROCESSES, vol.25, no.3, pp.143-147, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 25 Issue: 3
  • Publication Date: 2006
  • Journal Name: HIGH TEMPERATURE MATERIALS AND PROCESSES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.143-147
  • Middle East Technical University Affiliated: Yes

Abstract

This study gives the temperature dependence of the Raman frequencies for the lattice mode of upsilon(7) (TA) and the internal mode of upsilon(2) close to the X-phase transition (T-lambda=234K, P=\) in NB4Br.