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

被引：4
|
作者：
Kong, Jing [1 ]
Manjon-Sanz, Alicia [2 ]
Liu, Jue [2 ]
Marlton, Frederick [3 ]
Lo, Tsz Wing [1 ]
Lei, Dangyuan [1 ]
Jorgensen, Mads Ry Vogel [4 ,5 ,6 ]
Pramanick, Abhijit [1 ,7 ]
机构：
[1] City Univ Hong Kong, Dept Mat Sci & Engn, Hong Kong, Peoples R China
[2] Oak Ridge Natl Lab, Neutrons Scattering Div, Oak Ridge, TN 37831 USA
[3] Univ Technol Sydney, Sch Math & Phys Sci, Sydney, NSW 2007, Australia
[4] Aarhus Univ, Dept Chem, DK-8000 Aarhus C, Denmark
[5] Aarhus Univ, iNANO, DK-8000 Aarhus C, Denmark
[6] Lund Univ, MAX Lab 4, SE-22100 Lund, Sweden
[7] City Univ Hong Kong, Ctr Neutron Scattering, Hong Kong, Peoples R China
来源：
PHYSICAL REVIEW B | 2023年 / 107卷 / 22期
关键词：
DIFFRACTOMETER; PEROVSKITES;
D O I：
10.1103/PhysRevB.107.224103
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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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页数：8
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