Critical behaviour and the order parameter saturation in uniaxial ferroelectrics with the polar axes in and out of a crystallographic direction

Gała¸zka, M.; Zieliński, Piotr; Piecha, A.; Szklarz, Przemysław; Bator, G.

doi:10.1080/01411594.2010.509046

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Many-sublattice Pseudospin Ising Model1

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2013

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“…This dependence can be compared with pseudospin Ising model for uniaxial material (for example see Refs. [15,16]). Figure 3b shows the dependence of the order parameter r on temperature, with the coecients k s = 273k B and k r = 310k B .…”

Section: Many-sublattice Pseudospin Ising Modelmentioning

confidence: 99%

Nonclassical Critical Behaviour and Low Temperature Anomalies in Ferroelectric DMACA as Described by Many-Sublattice Model

Gałązka

Zieliński

2013

Acta Phys. Pol. A

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A model based on the crystallographic data on dimethylammonium nonachlorodiantimonate (DMACA) is constructed. Gradual orientational ordering of three inequivalent sublattices of the dimethylammonium cations is shown to be at the origin of the anomalous behaviour of the spontaneous polarisation in this material. A quantitative comparison with the experimental data reveals a temperature dependence of a coupling between two sublattices and a strong deformability of the underlying structure.

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Section: Many-sublattice Pseudospin Ising Modelmentioning

confidence: 99%