Abstract
The anomalous ESR line width broadening has been investigated near ferroelectric phase transition point of lithium heptagermanate Li2Ge7Oi5 (LGO) doped with Mn2+ ions. Temperature and orientational dependencies of ESR spectra show that line width broadening is contributed by low frequency (ω 107Hz) order parameter fluctuations associated with central peak in the excitation spectrum of LGO. The critical exponent of correlation length ≈ 0.63 derived from the ESR line width measurements is consistent with king model. It is assumed that long range dipole-dipole interactions become noticeable in the narrow vicinity near transition point.
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