Low-temperature dispersion of the electric susceptibilities in a mixed crystal of Rb_1-x(NH₄)ₓH₂PO₄ ($x=0.35$) is reported. The frustrated proton ordering of this system relates it to spin-glasses. The measurements reveal a broad distribution of relaxation times. The data scale using a temperature-independent distribution of activation energies linked to the relaxation times by a Vogel-Fulcher law with a freezing temperature of 10 K.
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E. Courtens (1984) studied this question.
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