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Brilllouin-scattering studies of ferroelectric [CH3NH3]5Bi2Cl11.
Autorzy
Rok wydania
1998
Czasopismo
Numer woluminu
58
Strony
14261-14269
DOI
10.1103/PhysRevB.58.14261
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
High-resolution Brillouin spectroscopy was used to investigate the elastic properties of@NH3~CH3!#5Bi2Cl11.The temperature dependences of nine phonon modes propagating in the directions@100#,@010#,@001#,@110#,@101#, and@011#were obtained in the temperature range from 120 to 330 K. Strong correlations were foundwith the electric polarization mode which exhibits anomalous behavior at 307 and 170 K. A theoreticalexplanation of the experimental observations was given in terms of Landau-type free energy expansion for twoinequivalent sublattices. Discussion was provided regarding the possible types of couplings between straintensor components and spontaneous polarization.
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