Dynamic nonlinear dielectric response of relaxor ferroelectric (PbMg1/3Nb2/3O3)(0.68)-(PbTiO3)(0.32) thin films - art. no. 132101

摘要

The dynamic nonlinear dielectric response of relaxor ferroelectric (PbMg1/3Nb2/3O3)(0.68)-(PbTiO3)(0.32) thin films was qualitatively analyzed. The dielectric response of epitaxial thin-film heterostructures deposited on La0.5Sr0.5CoO3/(001)MgO was measured as a function of the amplitude of the ac drive. In thin films, the temperature and frequency dependences of dynamic linear, third-order nonlinear and scaled third-order nonlinear, dielectric permittivities (epsilon(1),epsilon(3),a(3)) were reconstructed from the measured dielectric response of the heterostructures. The behavior of epsilon(1), epsilon(3), and a(3) was in qualitative and quantitative agreement with that experimentally observed in single-crystal relaxor ferroelectrics. The peaks in epsilon(1) and epsilon(3), and the increase in a(3) with decreasing temperature below that of the dielectric maximum corresponded to the recent modeling and could indicate a glassy state in the films. [References: 25]