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- W2070534908 abstract "We calculate here the temperature dependence of the damping constant using the expressions derived from the Matsushita's theory and the temperature dependence of the order parameter from the molecular field theory for the tricritical (1.5 kbar) and second order (2.8 kbar) phase transitions in NH4Cl. Our calculations are performed for the ν 5 (174 cm−1) Raman mode of NH4Cl for the pressures studied. Predictions for the damping constant are in good agreement with our observed Raman bandwidths of this lattice mode for both pressures. The Raman intensities calculated from the molecular field theory by means of the order parameter are also in good agreement with our observed Raman intensities of the ν 5 (174 cm−1) mode for both tricritical (1.5 kbar) and second order (2.8 kbar) phase transitions in NH4Cl. In this study our observed Raman intensities of this lattice mode are analysed using a power-law formula with the critical exponent β for the order parameter at those two pressures considered in NH4Cl. From our analysis, the value of β = 0.5 is obtained as the mean field value." @default.
- W2070534908 created "2016-06-24" @default.
- W2070534908 creator A5030636931 @default.
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- W2070534908 date "2006-01-11" @default.
- W2070534908 modified "2023-09-26" @default.
- W2070534908 title "Temperature dependence of the Raman bandwidths and intensities of a lattice mode near the tricritical and second order phase transitions in NH4Cl" @default.
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- W2070534908 doi "https://doi.org/10.1080/14786430500375167" @default.
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