Hypersound anomalies and elastic constants in single-crystal PbMg{sub 1/3}Nb{sub 2/3}O{sub 3} by Brillouin scattering
- Department of Physics, Montana State University, Bozeman, Montana 59717 (United States)
The longitudinal (LA) and transverse (TA) Brillouin spectra along [001] phonon direction have been measured as a function of temperature (50--475 K) in single-crystal PbMg{sub 1/3}Nb{sub 2/3}O{sub 3} with scattering angles {theta}{sub {ital s}}=180{degree} and 32.5{plus_minus}0.2{degree}. The Brillouin frequency shift with decreasing temperature shows a broad softening anomaly for both LA and TA phonon modes. For {theta}{sub {ital s}}=180{degree}, a gradual growth in damping with maximum near 270 K is observed and is attributed to order parameter fluctuations. An additional Landau--Khalatnikov maximum is also observed at {ital T}{sub {ital c}}{similar_to}212 K. This anomaly implies a rapid growth of ferroelectric ordering near {ital T}{sub {ital c}} and is consistent with the earlier linear birefringence results reported by Westphal {ital et} {ital al}. The elastic stiffness and compliance constants, {ital C}{sup {ital E}}{sub 11}, {ital C}{sup {ital E}}{sub 44}, and {ital s}{sup {ital E}}{sub 44} are also determined between 200 and 370 K. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.
- DOE Contract Number:
- FG05-91ER79046
- OSTI ID:
- 118399
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 9 Vol. 78; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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