Direct evidence of an order-disorder nature of ferroelectric phase transitions in K2MgWO2(PO4)2 | Zendy

Mirosław Mączka | Zendy; J. Hanuza | Zendy; A. Majchrowski | Zendy; Seiji Kojima | Zendy

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Direct evidence of an order-disorder nature of ferroelectric phase transitions in K2MgWO2(PO4)2

Author(s) -

Mirosław Mączka,

J. Hanuza,

A. Majchrowski,

Seiji Kojima

Publication year - 2007

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 - 10.1063/1.2713873

Subject(s) - ferroelectricity , condensed matter physics , phase transition , brillouin zone , relaxation (psychology) , ion , order (exchange) , coupling (piping) , brillouin scattering , phase (matter) , materials science , scattering , crystal (programming language) , chemistry , dielectric , physics , optics , psychology , computer science , metallurgy , programming language , social psychology , optoelectronics , organic chemistry , finance , optical fiber , economics

K2MgWO2(PO4)2 single crystal, related to famous optical nonlinear material KTiOPO4, was investigated by micro-Brillouin scattering with a focus on the central components of the relaxation modes. A critical slowing down has been clearly observed in the vicinity of T1=436 K while suppressed by the coupling with the order parameter. The temperature dependence of the relaxation time indicates that the former transition is the second order, while the latter is strongly first order. The obtained results show that disorder processes in the sublattice of potassium ions play a major role in the mechanism of these phase transitions

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