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Hypersonic anomalies and optical properties of RbTiOAsO 4 and KTiOPO 4 single crystals
| Content Provider | Semantic Scholar |
|---|---|
| Author | Katiyar, Ram Singh Schmidt, Verônica |
| Copyright Year | 1998 |
| Abstract | The longitudinal~LA ! Brillouin back-scattering spectra along the @001# phonon direction have been measured as a function of temperature for RbTiOAsO 4 ~RTA! and KTiOPO4 ~KTP! single crystals. As temperature increases, the acoustic-phonon frequencies of RTA and KTP show a clear softening ~wh ch reaches a turning point atTc;800 °C for RTA!. We conclude that the transitions in RTA and KTP are either weakly first order or of second order. It seems likely that the alkali ions (K 1 or Rb) are strongly involved in the soft mode. A broad damping evolution ~which attains a maximum at Tc;800 °C in RTA! was observed for both crystals and can be attributed to the dynamic order-parameter fluctuations. The optical transmissions, refractive indices (nx ,ny ,nz) and the Cauchy equations ~for RTA! were obtained as a function of wavelength. The LA @001# sound velocitiesVLA and elastic constants C331(e33 2 /«33 s ) were also calculated at room temperature for both crystals.@S0163-1829 ~99!10501-0# |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://scholarworks.montana.edu/xmlui/bitstream/handle/1/9703/VHSchimidt_PhysicalRev.B._59_1.pdf;sequence=1 |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Acoustic cryptanalysis Alkalies Brillouin scattering HHV8 ORF50 Gene Ions Iontophoresis Lactic acid Phonon Population Parameter Softening Xojo potassium titanylphosphate wavelength |
| Content Type | Text |
| Resource Type | Article |
