Dynamical Transition Between High Permittivity and Low Permittivity Oscillatory Regimes in a Ferroelectric Deep in the Ordered Phase

This preprint reports the experimental discovery of a dynamical transition between two distinct oscillatory regimes in a bulk ferroelectric operated at room temperature, far below its Curie temperature. Following a fast electrical excitation, the system evolves from a high‑permittivity, strongly damped response into a low‑permittivity, high‑Q oscillatory state. The transition is controlled by the initial charging voltage and reflects the nonlinear dependence of the effective capacitance on the polarization amplitude. A theoretical framework based on an inertial Landau–Khalatnikov–Tani model captures the existence of a dynamical threshold separating the two regimes. These results reveal a previously unexplored aspect of ferroelectric dynamics and establish the presence of multiple oscillatory attractors deep in the ordered phase.