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FIZIKA A 8 (1999) 4 , 229-238
 
MODEL FOR PARAMAGNETIC PROBE IN HYDROGEN BONDED FERROELECTRIC
D. MERUNKA AND B. RAKVIN
R. Bošković Institute, P.O. Box 1016, HR-10001 Zagreb, Croatia
Dedicated to Professor Boran Leontić on the occasion of his 70th
birthday
Received 28 October 1999; Accepted 20 March 2000
The modified strong dipole-proton coupling model and Monte Carlo calculation are
employed to describe paramagnetic defect in hydrogen bonded ferroelectric. In this model,
probe is treated as ``soft" dipole impurity in the system with N = 108 dipoles. The
effective double-well type potential of the probe is obtained and its temperature
dependence in the paraelectric phase is studied. It is shown that the experimentally
detected activation energy of the polarization fluctuation of the SeO43-
probe can be related to the effective activation energy. The model is compared with the
earlier proposed local ``pseudo freeze-out" model which exhibits larger deviation
from the experimental results than the suggested modified strong dipole-proton coupling
model.
PACS numbers: 77.84; 77.80.B
UDC 537.226
Keywords: hydrogen bonded ferroelectric, paramagnetic defect, SeO43-
probe
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