Monitoring of Longitudinal-Wave Velocity and Attenuation of SrTiO3 at Low Temperatures Using Picosecond Ultrasound Spectroscopy
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概要
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We measured the longitudinal-wave velocity and its attenuation in SrTiO3 between 20 and 300 K using picosecond ultrasound spectroscopy. From the temperature dependence of the velocity and attenuation, we monitored the cubic--tetragonal phase transition of SrTiO3 near 100 K, whereas no more transitions were indicated below 100 K. From the measured attenuation coefficients, we estimate the relaxation time \tau. Because of the ultrahigh frequency measurements, the product \omega\tau is larger than unity, where the traditional theory for phonon--phonon interaction fails to explain the relaxation time. We then derived the relationship between the relaxation time and attenuation for \omega\tau>1.
- 2012-07-25
著者
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YAMAMOTO Akihiro
Graduate School of Information Science and Electrical Engineering, Kyushu University
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Ogi Hirotsugu
Graduate School Of Engineering Science Osaka University
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Hirao Masahiko
Graduate School Of Engineering Sci. Osaka Univ.
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Nakamura Nobutomo
Graduate School Of Engineering Science Osaka University
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Nagakubo Akira
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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Tanigaki Kenichi
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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Tanigaki Kenichi
Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, Osaka 560-8531, Japan
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- Erratum: “Monitoring of Longitudinal-Wave Velocity and Attenuation of SrTiO