Bandwidths studied as a function of temperature in ammonium halides near Tlambda |
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Authors: | Yurtseven H |
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Institution: | Department of Physics, Middle East Technical University, 06531 Ankara, Turkey. phys@metu.edu.tr |
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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. |
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Keywords: | Damping constant Hard modes Ammonium halides |
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