Title: Ferroelectric order parameter in the two-particle cluster system near phase transition point: collective variables method
Author(s):

	M.A. Korynevskii (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine; Lviv Polytechnic National University, 12 S.Bandera Str., 79013 Lviv, Ukraine; Institute of Physics of the University of Szczecin, 15 Wielkopolska Str., 70451 Szczecin, Poland) ,
	V.B. Solovyan (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine)

A new approach in the investigation of the order parameter behaviour near ferroelectric phase transition point is suggested. The short range and dipole interactions between particles are taken into account. The logarithmic corrections and effective critical exponents are calculated and discussed.

Key words: phase transition, order parameter, critical indices, collective variables method
PACS: 76.30.K; 77.80Bh

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