Interface control of emergent ferroic order in Ruddlesden-Popper Sr${}_{n+1}$Ti${}_n$O${}_{3n+1}$

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

We have discovered from first-principles an unusual polar state in the low n Sr${}_{n+1}$Ti${}_n$O${}_{3n+1}$ Ruddlesden-Popper (RP) layered perovskites in which ferroelectricity is near…