Science Advances

Supplementary Materials

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  • fig. S1. PFM measurements on sample A1 do not show evidence of ferroelectric behavior.
  • fig. S2. Representative PFM images showing strong amplitude contrast and very weak phase contrast.
  • fig. S3. Observation of ferroelastic domains by PTIR.
  • fig. S4. Observation of ferroelastic domains by PTIR with s- and p-polarization.

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