Author： Audzijonis A. Zigas L. Zaltauskas R. Sereika R. Pauliukas A.
Publisher： Taylor & Francis Ltd
ISSN： 0731-5171
Source： Ferroelectrics Letters Section, Vol.35, Iss.3-4, 2008-01, pp. : 51-61
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Abstract
Experimental investigation of SbSI exponential absorption tail of slope σ/kT(T) and isoabsorption energy EK(T) at K = const reveal that in ferroelectric phase transition region at Tc the slope σ/kT(T) has anomalous behavior. Explanation of this phenomena presented using electronic potential V(z) dependence upon high frequency mode B1u symmetry normal coordinates in [image omitted](z) direction taking into account thermal fluctuations of the atoms in x - y plane. The splitting of B1u normal modes in double-well V(z) explains anomalous behavior σ/kT(T) at the ferroelectric phase transition region in SbSI and SbSBr crystals.
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