Strain coupling and scaling invariants in search for effective critical parameters of uniaxial ferroelectrics |
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| Authors: | Mirosław Gałązka Piotr Zieliński |
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| Institution: | 1. The H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, ulica Radzikowskiego 152, 31-342 Kraków, Poland;2. Cracow University of Technology, Institute of Physics, ul. Podchor??ych 1, 30-084 Kraków, Poland |
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| Abstract: | A scaling equation of state giving a realistic ratio of Curie–Weiss constants and accounting for coupling of the order parameter with a strain (secondary order parameter) is used to describe the temperature dependence of the electric susceptibility in an external biasing field applied in case of uniaxial ferroelectrics. Explicit expressions for the resulting scaling invariants are given. The power laws for the temperature and field dependence of the maxima and of the inflection points of the susceptibility curves are found. The theory is exemplified by the effective critical behaviour of iono-molecular crystals (CH3NH3)5Bi2Cl11 (MAPCB) and (CH3NH3)5Bi2Br11 (MAPBB). |
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