Aging mechanisms in field cooled PMN-PT 12{\%}

In the relaxor ferroelectric PMN-PT 12{\%} ((PbMg$_{1/3}$Nb$_{2/3}$O$_{3})_{0.88}$ (PbTiO$_{3})_{0.12})$ the dielectric susceptibility ($\varepsilon \prime $, $\varepsilon \prime \prime )$ and pyroelectric current I$_{P}$ were measured after different field-temperature histories. As previously reported [1], when the sample was cooled in zero field, standard spinglass-like aging of $\varepsilon \prime \prime $ was found in the glassy relaxor regime. Cooling in a DC electric field of 0.67 kV/cm drove a transition into a polarized ferroelectric-like state, which retained its polarization after the field was removed at low temperature. During 10 hours of subsequent zero-field aging at 160K, $\varepsilon \prime \prime $ showed almost no change. This suggests that the mechanisms responsible for glassy aging in the relaxor state are absent in the ferroelectric state. [1] L. Chao, et. al. \textbf{PRB} 74, 014105 (2006).