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cond-mat.mtrl-sci2000
The broad Brillouin doublets and central peak of KTaO_3
E. Farhi, A. K. Tagantsev, B. Hehlen +3
The incipient ferroelectric KTaO3 presents low-T Brillouin spectra anomalies,e.g. a broad central peak (CP), and some additional Brillouin doublets (BD), whose origin is interprete…
cond-mat.mtrl-sci2000
Low energy phonon spectrum and its parameterization in pure KTaO3 under 80 K
E. Farhi, A. K. Tagantsev, R. Currat +3
High resolution data on low energy phonon branches (acoustic and soft optic) along the three principal symmetry axes in pure KTaO3 were obtained by cold neutron inelastic scatterin…
cond-mat.mtrl-sci2000
Optical mode crossings and the low temperature anomalies of SrTiO3
E. Courtens, B. Hehlen, E. Farhi +1
Optical mode crossing is not a plausible explanation for the new broad Brillouin doublet nor for the strong acoustic anomalies observed at low temperatures in SrTiO3. Data presente…