Second sound in SrTiO3 |
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Authors: | Koreeda Akitoshi Takano Ryuta Saikan Seishiro |
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Affiliation: | Department of Physics, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan. |
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Abstract: | We study collective phonon excitations in SrTiO3 by low-frequency light scattering. We employ extended thermodynamics for phonon gas to construct a theoretical spectral function that is applicable regardless of local thermal equilibrium. Our analysis reveals the temperature dependence of tauN, the relaxation time for the momentum-conserving phonon collisions (normal processes), in SrTiO3. These results indicate that the previously reported anomalous soundlike spectrum originates from second sound, which is a wavelike propagation of heat. |
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