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Figure 1

From: Room temperature ferroelectricity in fluoroperovskite thin films

Figure 1

Ferroelectricity depending on growth and strain configurations. (a) Schematic of NaMnF3 unit cell21. (b) Polar mode frequency as functions of isotropic strain in the plane parallel to SrTiO3 (001) surface when NaMnF3 is grown with b-axis out-of-plane (top, the two curves indicate different a/c ratios) or in-plane (bottom). Arrows indicate the data points corresponding to commensurate growth and completely relaxed cases. Dashed lines are added as guide for the eye. Insets illustrate the orientations of NaMnF3 lattice relative to the cubic SrTiO3 unit cell.

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