title: Interfacial Octahedral Rotation Mismatch Control of the Symmetry and Properties of SrRuO3.
abstract: Epitaxial strain can be used to tune the properties of complex oxides with perovskite structure. Beyond just lattice mismatch, the use of octahedral rotation mismatch at heterointerfaces could also provide an effective route to manipulate material properties. Here, we examine the evolution of the structural motif (i.e., lattice parameters, symmetry, and octahedral rotations) of SrRuO3 films grown on substrates engineered to have the same lattice parameters, but different octahedral rotations. SrRuO3 films grown on SrTiO3 (001) (no octahedral rotations) and GdScO3-buffered SrTiO3 (001) (with octahedral rotations) substrates are found to exhibit monoclinic and tetragonal symmetry, respectively. Electrical transport and magnetic measurements reveal that the tetragonal films exhibit higher resistivity, lower magnetic Curie temperatures, and more isotropic magnetism as compared to those with monoclinic structure. Synchrotron-based quantification of the octahedral rotation network reveals that the tilting pattern in both film variants is the same (albeit with slightly different magnitudes of in-plane rotation angles). The abnormal rotation pattern observed in tetragonal SrRuO3 indicates a possible decoupling between the internal octahedral rotation and lattice symmetry, which could provide new opportunities to engineer thin-film structure and properties.
authors.affiliation: Department of Materials Science and Engineering, University of California , Berkeley, California 94720, United States.
authors.forename: Ran
authors.initials: R
authors.lastname: Gao
authors.affiliation: National Synchrotron Radiation Laboratory and CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China.
authors.forename: Yongqi
authors.initials: Y
authors.lastname: Dong
authors.affiliation: National Synchrotron Radiation Laboratory and CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China.
authors.forename: Han
authors.initials: H
authors.lastname: Xu
authors.affiliation: X-ray Science Division, Advanced Photon Source, Argonne National Laboratory , Argonne, Illinois 60439, United States.
authors.forename: Hua
authors.initials: H
authors.lastname: Zhou
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , State College, Pennsylvania 16802, United States.
authors.forename: Yakun
authors.initials: Y
authors.lastname: Yuan
authors.affiliation: Department of Materials Science and Engineering, Pennsylvania State University , State College, Pennsylvania 16802, United States.
authors.forename: Venkatraman
authors.initials: V
authors.lastname: Gopalan
authors.affiliation: National Synchrotron Radiation Laboratory and CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China.
authors.forename: Chen
authors.initials: C
authors.lastname: Gao
authors.affiliation: Materials Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States.
authors.forename: Dillon D
authors.initials: DD
authors.lastname: Fong
authors.affiliation: Department of Materials Science and Engineering, University of California , Berkeley, California 94720, United States.|Materials Science Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Zuhuang
authors.initials: Z
authors.lastname: Chen
authors.affiliation: National Synchrotron Radiation Laboratory and CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China , Hefei, Anhui 230026, People's Republic of China.
authors.forename: Zhenlin
authors.initials: Z
authors.lastname: Luo
authors.affiliation: Department of Materials Science and Engineering, University of California , Berkeley, California 94720, United States.|Materials Science Division, Lawrence Berkeley National Laboratory , Berkeley, California 94720, United States.
authors.forename: Lane W
authors.initials: LW
authors.lastname: Martin
keywords: SrRuO3; crystal symmetry; epitaxial strain; interfacial engineering; octahedral rotation