Abstract
Abstract The extensive literature available on anomalies in NMR relaxation rate, near Tc, in KDP-type ferroelectrics, is analyzed both in terms of the “collective model-fluctuation dissipation theorem,” method, as well as in terms of critical indices. The first method gives a non-interacting dipolar relaxation time TC ∼ 5(10−13) sec, in reasonable agreement with available dielectric relaxation results. While previously reported data does not show unambiguous evidence for “true” critical regime behavior, new proton relaxation data in KH2ASO4 is better described by power law rather than logarithmic behavior. This may be a result of true critical effects.
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