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- W2036412696 abstract "The Larkin-Khmelnitskii theory of uniaxial ferroelectrics is used to derive further predictions for the critical behavior of ferroelectrics, including local properties and transport properties. Special attention is paid to the experimental observability of the predicted logarithmic correction terms. In particular, in the expansion of the electric field E in powers of the dielectric polarization $P$, i.e., $E=Pensuremath{Sigma}{i}^{}{f}_{2i}(T){P}^{2i}$, the temperature dependence of the coefficients ${f}_{2}ensuremath{propto}{|mathrm{ln}(frac{T}{{T}_{c}ensuremath{-}1})|}^{ensuremath{-}1}$ and ${f}_{4}ensuremath{propto}{(frac{T}{{T}_{c}ensuremath{-}1})}^{ensuremath{-}1}{|mathrm{ln}(frac{T}{{T}_{c}ensuremath{-}1})|}^{ensuremath{-}frac{4}{3}}$ is obtained, deviating significantly from ${f}_{2}=mathrm{const}$ and ${f}_{4}=mathrm{const}$ of the simple Landau theory. We argue that the nonanalytic behavior of ${f}_{2}$ could be measured more easily than either the logarithmic correction in ${f}_{0}ensuremath{propto}(frac{T}{{T}_{c}ensuremath{-}1}){|mathrm{ln}(frac{T}{{T}_{c}ensuremath{-}1})|}^{ensuremath{-}frac{1}{3}}$ or the specific-heat singularity $Censuremath{propto}{|mathrm{ln}(frac{T}{{T}_{c}ensuremath{-}1})|}^{frac{1}{3}}$. We show that recent experiments on tri-glycine sulfate by Ehses and Muser are in good agreement with our predictions. Moreover, we calculate the temperature dependence of the critical contribution to the Debye-Waller-factor exponent $W$ which corresponds to that of the electron-paramagnetic-resonance linewidth in the slow-motion regime. We find ${W}_{mathrm{crit}}ensuremath{propto}(frac{T}{{T}_{c}ensuremath{-}1})ifmmodetimeselsetexttimesfi{}{|mathrm{ln}(frac{T}{{T}_{c}ensuremath{-}1})|}^{frac{1}{3}}$ above ${T}_{c}$ and ${W}_{mathrm{crit}}ensuremath{propto}(frac{1ensuremath{-}T}{{T}_{c}}){|mathrm{ln}(frac{T}{{T}_{c}ensuremath{-}1})|}^{frac{2}{3}}$ below ${T}_{c}$. A reinterpretation of available experiments is suggested. Finally, we obtain the temperature dependence of the critical contributions to the $mathrm{dc}$ electrical resistivity $ensuremath{rho}$ both for ferroelectrics and other structural phase transitions. While $frac{densuremath{rho}}{mathrm{dT}}$ is shown to have the same singularity as the specific heat in ferroelectrics both below ${T}_{c}$ and above ${T}_{c}$ we obtain in the other cases $frac{densuremath{rho}}{mathrm{dT}}ensuremath{propto}{(frac{1ensuremath{-}T}{{T}_{c}})}^{2ensuremath{beta}ensuremath{-}1}$ for $T<{T}_{c}$, and $frac{densuremath{rho}}{mathrm{dT}}ensuremath{propto}Censuremath{propto}{(frac{T}{{T}_{c}ensuremath{-}1})}^{ensuremath{-}ensuremath{alpha}}$ for $T>{T}_{c}$, where $ensuremath{beta}$ is the orderparameter exponent. A discussion of a recent experiment in SnTe is given, and our results for the electrical resistivity of semiconducting ferroelectrics are compared with those for ferromagnets and antiferromagnets." @default.
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- W2036412696 title "Equation of state, Debye-Waller factor, and electrical resistivity of ferroelectrics near their critical point" @default.
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- W2036412696 doi "https://doi.org/10.1103/physrevb.13.4890" @default.
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