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Broadband Brillouin scattering study of ferroelectric instability of barium sodium niobate | | S. Kojima
; | | Date: |
3 Jan 2023 | | Abstract: | The barium sodium niobate (BNN) with tungsten-bronze structure is one of
well-known optical crystals for electro-optic and nonlinear optic applications.
This paper reviews the ferroelectric instability of BNN crystals. BNN is a
uniaxial ferroelectric with a spontaneous polarization along the tetragonal
$c$-axis. There is no report on the observation of an optical soft mode
responsible for a ferroelectric phase transition. In the vicinity of the Curie
temperature, $T_{ ext{C}}=560$°C, an intense central peak (CP) related to
the polarization fluctuations along the $c$-axis was observed by the broadband
Brillouin scattering experiment. The relaxation time determined by the CP width
shows the critical slowing down towards $T_{ ext{C}}$. This fact indicates
that the ferroelectric instability of BNN is an order-disorder type. | | Source: | arXiv, 2301.01341 | | Services: | Forum | Review | PDF | Favorites | |
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