Slides - International Centre for Theoretical Sciences
Slides - International Centre for Theoretical Sciences
Slides - International Centre for Theoretical Sciences
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InMnO 3: Origin of ferroelectricity (geometric)<br />
Q K: Tilting of MnO 5 polyhedra (unstable)<br />
Q Г: Ferroelectric mode (stable)<br />
Born charges: Nominal (In, 3+), (Mn, 3+).<br />
Off-centering of In and Mn is not favored<br />
~ 8 and 15 eV/A 2 (very stable)<br />
K 3 mode: is the primary instability (electrostatics)<br />
Г mode feels a <strong>for</strong>ce once K 3 is frozen in.