Interface control of emergent ferroic order in Ruddlesden-Popper Sr n+1Ti nO 3n+1

Turan Birol, Nicole A. Benedek, Craig J. Fennie

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We discovered from first principles an unusual polar state in the low n Sr n+1Ti nO 3n+1 Ruddlesden-Popper (RP) layered perovskites in which ferroelectricity is nearly degenerate with antiferroelectricity, a relatively rare form of ferroic order. We show that epitaxial strain plays a key role in tuning the "perpendicular coherence length" of the ferroelectric mode, and does not induce ferroelectricity in these low-dimensional RP materials as is well known to occur in SrTiO 3. These systems present an opportunity to manipulate the coherence length of a ferroic distortion in a controlled way, without disorder or a free surface.

Original languageEnglish (US)
Article number257602
JournalPhysical review letters
Issue number25
StatePublished - Dec 13 2011
Externally publishedYes


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