Lineshape of brillouin spectra in the incommensurate phase of quartz (SiO₂): Analysis by fano's formula

Kohji Abe Department of Applied Physics and Chemistry, The University of Electro-Communications Chofu, Tokyo 182, Japan

Katsuya Aboshi Department of Applied Physics and Chemistry, The University of Electro-Communications Chofu, Tokyo 182, Japan

Kenji Kawasaki Department of Applied Physics and Chemistry, The University of Electro-Communications Chofu, Tokyo 182, Japan

Takeshi Shigenari Department of Applied Physics and Chemistry, The University of Electro-Communications Chofu, Tokyo 182, Japan

Abstract

Rayleigh-Brillouin spectra near the α-INC-β phase transition of quartz were measured. Near the INC-phase, a plateau appears between the LA-mode and the Rayleigh line. In order to take account of the interaction between the continuum (two phonon scattering from the soft branch) and the discrete LA-mode, Fano's formula was used in the analysis of the asymmetric spectra. The results are consistent with the interpretation of the low frequency Raman spectra observed by Berge et al. and they also agree with the ultrasonic data indicating that the single relaxation mechanism explains the temperature dependence of the sound wave near the β→INC phase transition.

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Lineshape of brillouin spectra in the incommensurate phase of quartz (SiO₂): Analysis by fano's formula

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Lineshape of brillouin spectra in the incommensurate phase of quartz (SiO2): Analysis by fano's formula

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Lineshape of brillouin spectra in the incommensurate phase of quartz (SiO₂): Analysis by fano's formula