Topological defects at octahedral tilting plethora in bi-layered perovskites

Fei Ting Huang, Bin Gao, Jae Wook Kim, Xuan Luo, Yazhong Wang, Ming Wen Chu, Chung Kai Chang, Hwo Shuenn Sheu, Sang Wook Cheong

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


Oxygen octahedral distortions, including tilts/rotations, deformations and off-centring in (layered) perovskites, have the key role in their numerous functional properties. Near the polar-centrosymmetric phase boundary in bi-layered perovskite Ca3xSrxTi2O7 with x≈1, we found the presence of abundant topological eight-state vortex-antivortex pairs, associated with four oxygen octahedral tilts at domains and another four different oxygen octahedral tilts at domain walls. Our discovery opens a new revenue to unveil realspace topological defects associated with the possible vector choices in one specific lattice mode.

Original languageEnglish (US)
Article number16017
Journalnpj Quantum Materials
StatePublished - Oct 7 2016

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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