Attenuation process of the longitudinal phonon mode in a 
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 crystal in the 20-GHz range

Ohno, Seigo; Sonehara, T.; Tatsu, E.; Koreeda, Akitoshi; Saikan, S.

doi:10.1103/physrevb.95.224301

Cited by 1 publication

(1 citation statement)

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“…The relatively large error bars for the TA2 at high temperatures are due to the weak signal intensity resulting from the partial absorption of 532 nm light at around 300 K; at lower temperatures, the signal intensity increases because the absorption edge shifts to the shorter wavelength on cooling. While the hardening of phonons on cooling is an ordinary behavior, 39,40) the softening of the LA mode on cooling is somewhat unusual, which is not covered in the previous measurements conducted at higher temperatures. 27) The temperature dependences of n and/or r can be the origin of this apparent softening (frequency decrease), but it is not compatible with the hardening of the TA modes, the identical n and/or r values are relevant.…”

Section: Resultsmentioning

confidence: 85%

Brillouin scattering of multiferroic BiFeO₃

Ishida

Oishi

Fujii

et al. 2023

Jpn. J. Appl. Phys.

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We performed Brillouin light scattering spectroscopy on a single crystal of BiFeO_3 (BFO) in the temperature range from 110 K to 300 K and observed the Brillouin scattering from the longitudinal acoustic (LA) and transverse acoustic (TA) phonon modes, which were traveling along the c-axis. We determined the elastic constants for the LA mode (C_33) and TA mode (C_44) to be approximately 251 GPa and 90.3~103 GPa at 300 K, respectively. We observed splitting of the degenerate TA modes (corresponding to the elastic constant C_44), which is not expected for the TA modes traveling along the three-fold symmetry axis (the c-axis) of BFO. We also present the temperature dependences of the frequencies of the LA and TA modes, which include anomalies such as the LA mode softening and TA mode frequency drop at around 210 K.

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Section: Resultsmentioning

confidence: 85%