title: Field-induced orbital and magnetic phases in Ca3Ru2O7.
abstract: Magnetic-field- and temperature-dependent Raman scattering studies of Ca3Ru2O7 reveal dramatic field-dependent properties arising from transitions between various complex orbital and magnetic phases, including a field-induced orbital-ordered to orbital-disordered transition (H(o) // hard axis), and a reentrant orbital-ordered to orbital-disordered to orbital-ordered transition (H(o) // easy axis). We find that the dramatic magnetic-field properties are most prevalent in a "mixed"-magnetic and -orbital phase regime, providing evidence for a strong connection between orbital phase inhomogeneity and "colossal" field effects in the ruthenates.
authors.affiliation: Department of Physics and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.
authors.forename: J F
authors.initials: JF
authors.lastname: Karpus
authors.forename: R
authors.initials: R
authors.lastname: Gupta
authors.forename: H
authors.initials: H
authors.lastname: Barath
authors.forename: S L
authors.initials: SL
authors.lastname: Cooper
authors.forename: G
authors.initials: G
authors.lastname: Cao