Temperature dependence of the first-order Raman phonon lines in GaS0.25Se0.75 layered crystals


Gasanly N.

ACTA PHYSICA POLONICA A, cilt.102, sa.6, ss.801-810, 2002 (SCI İndekslerine Giren Dergi) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 102 Konu: 6
  • Basım Tarihi: 2002
  • Doi Numarası: 10.12693/aphyspola.102.801
  • Dergi Adı: ACTA PHYSICA POLONICA A
  • Sayfa Sayıları: ss.801-810

Özet

Systematic measurements by Raman scattering. of the frequency and line width of the zone-center optical modes in GaS0.25Se0.75 layered crystal over the temperature, range of 10-300 K are carried out. The analysis of-temperature dependence of intralayer modes shows that frequency shift and line broadening are successfully modeled by including the contributions from thermal expansion and lattice anharmonicity. The purely anharmonic contribution (phonon-phonon coupling) is found to be due to three-phonon processes.