4.6 Article

Scaling behavior of order parameters for the hybrid improper ferroelectric (Ca, Sr)3Ti2O7

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PHYSICAL REVIEW B
卷 107, 期 22, 页码 -

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AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.107.224103

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We demonstrate that the oxygen octahedral tilt (R) and polarization (P) in the A3B2O7 Ruddlesden-Popper hybrid improper ferroelectric (Ca, Sr)3Ti2O7 follows a 2D Ising class scaling behavior near the para-to-ferroelectric transition temperature (Tc), contrary to the conventional mean-field Landau-type behavior. Additionally, we observe that P undergoes a transition from 2D Ising to 3D mean-field critical behavior at a temperature Td < Tc, which is driven by enhanced interlayer dipolar correlations arising from the increase in ferroelectrically active B-site centered dipoles.
We show that in contrast to the conventional view of a mean-field Landau-type behavior, the oxygen octahedral tilt (R) and polarization (P) in the A3B2O7 Ruddlesden-Popper hybrid improper ferroelectric (Ca, Sr)3Ti2O7 exhibits the scaling behavior of a 2D Ising class near the para-to-ferroelectric transition temperature (Tc). We also show that P exhibits an additional transition from a 2D Ising to a 3D mean-field critical behavior at a temperature Td < Tc, which is driven by enhanced interlayer dipolar correlations due to an increase in the ferroelectrically active B-site centered dipoles.

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