BRILLOUIN-SCATTERING OBSERVATION OF THE TA-TO COUPLING IN SRTIO3

Authors
HEHLEN B ARZEL L TAGANTSEV AK COURTENS E INABA Y YAMANAKA A INOUE K
Citation
B. Hehlen et al., BRILLOUIN-SCATTERING OBSERVATION OF THE TA-TO COUPLING IN SRTIO3, Physical review. B, Condensed matter, 57(22), 1998, pp. 13989-13992
Citations number
32
Categorie Soggetti
Physics, Condensed Matter
Journal title
Physical review. B, Condensed matter → ACNP
ISSN journal
01631829
Volume
57
Issue
22
Year of publication
1998
Pages
13989 - 13992
Database
ISI
SICI code
0163-1829(1998)57:22<13989:BOOTTC>2.0.ZU;2-4
Abstract
Brillouin scattering from transverse-acoustic modes of SrTiO3 is obser ved, while the frequencies of the soft polar modes are remeasured with hyper-Raman scattering. It is shown that an anomalous decrease of sou nd velocities at low temperatures results from the.coupling of the str ain with the gradient of the electrical polarization fluctuations. The corresponding anomaly in the acoustic width indicates an inhomogeneou s broadening of the soft polar mode.