title: Magnetic color symmetry of lattice rotations in a diamagnetic material.
abstract: Oxygen octahedral rotations are the most common phase transitions in perovskite crystal structures. Here we show that the color symmetry of such pure elastic distortions is isomorphic to magnetic point groups, which allows their probing through distinguishing polar versus magnetic symmetry. We demonstrate this isomorphism using nonlinear optical probing of the octahedral rotational transition in a compressively strained SrTiO3 thin film that exhibits ferroelectric (4mm) and antiferrodistortive (4{'}mm{'}) phases evolving through independent phase transitions. The approach has broader applicability for probing materials with lattice rotations that can be mapped to color groups.
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors.forename: S
authors.initials: S
authors.lastname: Denev
authors.forename: A
authors.initials: A
authors.lastname: Kumar
authors.forename: M D
authors.initials: MD
authors.lastname: Biegalski
authors.forename: H W
authors.initials: HW
authors.lastname: Jang
authors.forename: C M
authors.initials: CM
authors.lastname: Folkman
authors.forename: A
authors.initials: A
authors.lastname: Vasudevarao
authors.forename: Y
authors.initials: Y
authors.lastname: Han
authors.forename: I M
authors.initials: IM
authors.lastname: Reaney
authors.forename: S
authors.initials: S
authors.lastname: Trolier-McKinstry
authors.forename: C-B
authors.initials: CB
authors.lastname: Eom
authors.forename: D G
authors.initials: DG
authors.lastname: Schlom
authors.forename: V
authors.initials: V
authors.lastname: Gopalan