EIT-like effect due to hetero-phase oscillations near the phase transition of relaxor ferroelectrics

We report the observation of a remarkable ``transparency window'' in the dielectric resonant absorption spectrum of the relaxor ferroelectric K$_{1-x}$Li$_{x}$TaO$_{3 }$(KLT) in the vicinity of its weakly first order transition. This phenomenon is shown to be conceptually similar to the electro-magnetically induced transparency (EIT) phenomenon observed in certain atomic vapors. In KLT however, it reveals the presence of hetero-phase (cubic-tetragonal) fluctuations and provides unique information on the nature and mechanism of the phase transition in relaxors.