Dielectric Dispersion in Ferroelectric Ca<sub>2</sub>Sr(C<sub>2</sub>H<sub>5</sub>CO<sub>2</sub>)<sub>6</sub>
TL;DRAbstract
The complex dielectric constant ε (ω) of Ca 2 Sr(C 2 H 5 CO 2 ) 6 along the tetragonal c -axis was measured at 54 different frequencies between 10 3 Hz and 10 9 Hz. In the paraelectric phase, ε (ω) is well described by the Debye dispersion formula with a single relaxation time except in the vicinity of the Curie temperature T c . In the temperature region of \(0{<}T-T_{\text{c}}{\lesssim}3\) K, the second dispersion of a resonant type is observed in addition to the Debye type dispersion. The temperature dependence of the relaxation time τ of the Debye dispersion is well expressed in the temperature rarnge \(\text{1 K}{\lesssim}T-T_{\text{c}}\) by a power law, τ∝( T - T c ) - Δ with Δ =1.31, which is larger than the critical exponent γ=1.28 for the static dielectric constant obtained by extrapolation of the Debye dispersion.
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The complex dielectric constant ε (ω) of Ca 2 Sr(C 2 H 5 CO 2 ) 6 along the tetragonal c -axis was measured at 54 different frequencies between 10 3 Hz and 10 9 Hz. In the paraelectric phase, ε (ω) is well described by the Debye dispersion formula with a single relaxation time except in the vicinity of the Curie temperature T c . In the temperature region of \(0{<}T-T_{\text{c}}{\lesssim}3\) K, the second dispersion of a resonant type is observed in addition to the Debye type dispersion. The temperature dependence of the relaxation time τ of the Debye dispersion is well expressed in the temperature rarnge \(\text{1 K}{\lesssim}T-T_{\text{c}}\) by a power law, τ∝( T - T c ) - Δ with Δ =1.31, which is larger than the critical exponent γ=1.28 for the static dielectric constant obtained by extrapolation of the Debye dispersion.
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