TEMPERATURE DEPENDENCE OF THE DAMPING CONSTANT CLOSE TO THE I-II PHASE TRANSITION IN s-TRIAZINE

Kavruk D., YURTSEVEN H. H.

INTERNATIONAL JOURNAL OF MODERN PHYSICS B, cilt.24, sa.3, ss.369-380, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 24 Sayı: 3
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1142/s0217979209053825
  • Dergi Adı: INTERNATIONAL JOURNAL OF MODERN PHYSICS B
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.369-380
  • Orta Doğu Teknik Üniversitesi Adresli: Evet

Özet

The damping constant is calculated here at various temperatures for the Raman mode II in s-triazine using the soft mode-hard mode coupling model. The temperature dependence of the order parameter is used as the input data to calculate the damping constant of the Raman mode studied in this coupling model for s-triazine close to the I-II transition (T-c = 198 K). The soft mode-hard mode coupling model which considers the coupling of the soft acoustic mode with the optic modes in s-triazine, is fitted to the observed halfwidths of the Raman mode II close to the I-II phase transition in this crystal.