Browsing by Author "Hauke, Tilo"

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    Dynamics of polarization reversal in purified Rb2ZnCl4
    (1997-01-01) Hauke, Tilo; Müller, Volkmar; Beige, Horst; Fousek, Jan
    The dynamics of polarization reversal in sinusoidal fields (0. 1Hz≤f≤50kHz) was studied in the ferroelectric lock-in phase of purified Rb2ZnCl4 crystals. The frequency dependence of remanent polarization and coercive field Ec is qualitatively the same above and below T*≈160K, where for all measuring frequencies Ec starts to increase rapidly with decreasing temperature. A model which treats sideways shifts of planar, nearly regularly arranged domain walls as the only mechanism of polarization reversal in Rb2ZnCl4 is applicable for the quantitative description of ferroelectric hysteresis loops in the whole temperature interval under investigation. The anomalous increase of Ec at T* seems to be connected to a corresponding increase of the viscosity coefficient.
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    Modeling of dynamic ferroelectric hysteresis loops in purified Rb2ZnCl4
    (1996-01-01) Hauke, Tilo; Müller, Volkmar; Beige, Horst; Fousek, Jan
    Dynamic hysteresis loops were recorded in the ferroelectric lock-in phase of purified Rb2ZnCl4 crystals at a temperature T=188 K which is 5 K below the incommensurate-commensurate phase transition. The hysteresis loops observed in the frequency range 50 Hz<f<5 kHz can quantitatively be described by a model that treats a sideways shift of planar, nearly regular arranged domain walls as the only mechanism of polarization reversal in Rb2ZnCl4. Due to defect interaction, the velocity v of the domain wall depends nonlinearly on the effective force F acting on it and a scaling behavior v∼(F-Fc)θ with θ=1.45 is observed. © 1996 American Institute of Physics.