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We report a study of the 16.5 GHz dielectric function of hydrogenated anddeuterated organic salts (TMTTF)$_2$PF$_6$. The temperature behavior of thedielectric function is consistent with short-range polar order whose relaxationtime decreases rapidly below the charge ordering temperature. If thistransition has more a relaxor character in the hydrogenated salt, chargeordering is strengthened in the deuterated one where the transition temperaturehas increased by more than thirty percent. Anomalies in the dielectric functionare also observed in the spin-Peierls ground state revealing some intricatelattice effects in a temperature range where both phases coexist. The variationof the spin-Peierls ordering temperature under magnetic field appears to followa mean-field prediction despite the presence of spin-Peierls fluctuations overa very wide temperature range in the charge ordered state of these salts.

Microwave dielectric study of spin-Peierls and charge ordering transitions in (TMTTF)$_2$PF$_6$ salts