Order–disorder behavior of ferroelectric phase transition of KTa1−xNbxO3 probed by Brillouin scattering | Zendy

Ryu Ohta | Zendy; Junta Zushi | Zendy; Takuma Ariizumi | Zendy; Seiji Kojima | Zendy

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Order–disorder behavior of ferroelectric phase transition of KTa1−xNbxO3 probed by Brillouin scattering

Author(s) -

Ryu Ohta,

Junta Zushi,

Takuma Ariizumi,

Seiji Kojima

Publication year - 2011

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.3560345

Subject(s) - ferroelectricity , condensed matter physics , tantalate , tetragonal crystal system , brillouin scattering , phase transition , curie temperature , materials science , softening , brillouin zone , scattering , soft modes , potassium niobate , relaxation (psychology) , optics , chemistry , crystallography , dielectric , crystal structure , physics , ferromagnetism , psychology , social psychology , optical fiber , composite material , optoelectronics

The precursor dynamics of a cubic–tetragonal ferroelectric phase transition of potassium tantalate niobate (KTa1−xNbxO3 with x = 0.32) crystals is studied by Brillouin scattering. The appearance of the central peak (CP) and marked softening of the elastic constant c11 are clearly observed above the Curie temperature, TC–T, owing to the interaction between the LA mode and local polarization fluctuations of polar nanoregions (PNRs). The relaxation time determined by the CP width clearly shows a critical slowing down above TC–T, indicating an order–disorder feature of the ferroelectric phase transition. The size of a dynamic PNR is evaluated, and it increases toward TC–T

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