title: Bandwidths studied as a function of temperature in ammonium halides near Tlambda.
abstract: This study gives our analysis of the Raman bandwidths using the soft mode-hard mode coupling model applied to ammonium halides. The temperature dependence of our observed bandwidths for the nu5(174 cm-1) Raman mode of NH4Cl and nu5(177 cm-1) Raman mode of NH4Br, is analyzed close to phase transitions. From our analysis, we obtain beta=0.13 as the values of the critical exponent for the order parameter in the first order phase region for the ammonium halides.
authors.affiliation: Department of Physics, Middle East Technical University, 06531 Ankara, Turkey. phys@metu.edu.tr
authors.forename: H
authors.initials: H
authors.lastname: Yurtseven
mesh_terms: D000643:Ammonium Chloride / Q000737:chemistry*; D001965:Bromides / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds; D013059:Spectrum Analysis, Raman; D013696:Temperature
chemical_list: D001965:Bromides; D000644:Quaternary Ammonium Compounds; D000643:Ammonium Chloride; C051470:ammonium bromide