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. 2020 Dec 11;11:6361. doi: 10.1038/s41467-020-19907-2

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© This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2020

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Fig. 1 — a–c Free energy vs. order parameter–polarization components P_i/P_S and (d–f) distribution of these P_i/P_S across the domain wall for Models 1–3. Note that we fixed the coefficients a₁, a₁₁, and a₁₁₁, and recalculated the spontaneous polarization P_S and parameter η from them for Model 2. For Model 3, component P₁ is not observable by STEM.