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Epitaxial CaMnO3 films grown with 2.3% tensile strain on (001)-orientedLaAlO3 substrates are found to be incipiently ferroelectric below 25 K. Opticalsecond harmonic generation (SHG) was used for the detection of the incipientpolarization. The SHG analysis reveals that CaMnO3 crystallites with in-planeorientation of the orthorhombic b axis contribute to an electric polarizationoriented along the orthorhombic a (resp.\ c) axis in agreement with thepredictions from density functional calculations.

Incipient ferroelectricity in 2.3% tensile-strained CaMnO3 films