Topological defects at octahedral tilting plethora in bi-layered perovskites

Abstract

Oxygen octahedral distortions including tilts/rotations, deformations and off-centering in (layered) perovskites play the key role in their numerous functional properties. At the polar-centrosymmetric phase boundary in bi-layered perovskite Ca3-xSrxTi2O7 with x~1, we found the presence of abundant topological Z8 vortex-antivortex pairs, associated with four oxygen octahedral tilts at domains and another four different oxygen octahedral tilts at domain boundaries. Our discovery opens a new revenue to unveil topological defects associated with various types of oxygen octahedral distortions.

12 pages, 4 figures

References in corpus (4)

• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Steric engineering of metal-halide perovskites with tunable optical band gaps
• Experimental demonstration of hybrid improper ferroelectricity and presence of abundant charged walls in (Ca,Sr)${}_3$Ti${}_2$O${}_7$ crystals
• High Mobility in a Stable Transparent Perovskite Oxide

Cited by in corpus (6)

• Aperiodic topological order in the domain configurations of functional materials
• Highly tunable ferroelectricity in hybrid improper ferroelectric Sr3Sn2O7
• Magnetic structure and multiferroicity of Sc-substituted hexagonal YbFeO${}_3$
• Mapping the structural transitions controlled by the trilinear coupling in Ca3-xSrxTi2O7
• Evolution of topological defects at two sequential phase transitions of Nd2SrFe2O7
• Charged domain boundaries stabilized by translational symmetry breaking in the hybrid improper ferroelectric Ca${}_{3-x}$Sr${}_x$Ti${}_2$O${}_7$