Abstract
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.
| Original language | English |
|---|---|
| Article number | 224103 |
| Journal | Physical Review B |
| Volume | 107 |
| Issue number | 22 |
| DOIs | |
| State | Published - Jun 1 2023 |
Funding
The work described in this paper was partially supported by a grant from the Research Grants Council of the Hong Kong Special Administrative Region, China (Project No. eg CityU 11306720). J.K. and A.P. acknowledge support from the Research Talent Hub (RTH) program of the Innovation and technology Commission (ITC), Hong Kong. A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory (Grant No. IPTS-27376 for POWGEN and NOMAD experiments). F.M. and M.R.V.J. thank the Danish Agency for Science, Technology, and Innovation for funding the instrument center DanScatt.
| Funders | Funder number |
|---|---|
| Research Talent Hub | |
| Office of Science | |
| Oak Ridge National Laboratory | IPTS-27376 |
| City University of Hong Kong | 11306720 |
| Danish Agency for Science and Higher Education | |
| Research Grants Council, University Grants Committee | |
| Innovation and Technology Commission |