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Optical studies of order parameter fluctuations in solid solutions based on lead germanate crystals
1Kushnir O.S., 2Shopa R.Y., 3Vlokh R.O.

1Electronics Department, Lviv National University, 107 Tarnavski St., 79017 Lviv, Ukraine
2College of Natural Science at Lviv National University, 107 Tarnavski St., 79017 Lviv, Ukraine
3Institute of Physical Optics, 23 Dragomanov St., 79005 Lviv, Ukraine
 

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The approach for interpreting fluctuations seen in optical activity is suggested based on the first fluctuation correction to the Landau theory. Quantitative analyses of the fluctuation effects for Si-, Ba- and Bi-containing crystals of lead germanate family show applicability of the model. Critical indices governing temperature behaviour of the order parameter of ferroelectric phase transition are found for the crystals under study.

Keywords: photonic crystals, photonic forbidden gap, stop band, fluorescence spectra, photon density of states

PACS: 77.80.Bh, 64.60.Fr, 77.84Bw, 78.20Wc, 61.72.Ww
UDC : 535.56, 536.77
Ukr. J. Phys. Opt. 9 169-181 
doi: 10.3116/16091833/9/3/169/2008
Received: 18.04.2008
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