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A combined experimental and computational investigation of coupling betweenpolarization and epitaxial strain in highly polar ferroelectricPbZr_0.2Ti_0.8O_3 (PZT) thin films is reported. A comparison of the propertiesof relaxed (tetragonality c/a = 1.05) and highly-strained (c/a = 1.09)epitaxial films shows that polarization, while being amongst the highestreported for PZT or PbTiO_3 in either film or bulk forms (P_r = 82microC/cm^2), is almost independent of the epitaxial strain. We attribute thisbehavior to a suppressed sensitivity of the A-site cations to epitaxial strainin these Pb-based perovskites, where the ferroelectric displacements arealready large, contrary to the case of less polar perovskites, such as BaTiO_3.In the latter case, the A-site cation (Ba) and equatorial oxygen displacementscan lead to substantial polarization increases.

Suppressed dependence of polarization on epitaxial strain in highly polar ferroelectrics