title: Orbital-order-induced metal-insulator transition in La(1-x)Ca(x)MnO3.
abstract: We present evidence that the insulator-to-metal transition in La(1-x)Ca(x)MnO3 near x approximately 0.2 is driven by the suppression of coherent Jahn-Teller distortions, originating from d-type orbital ordering. The orbital-ordered state is characterized by large long-range Q2 distortions below T(O'- O*). Above T(O'- O*) we find evidence for coexistence between an orbital-ordered and an orbital-disordered state. This behavior is discussed in terms of electronic phase separation in an orbital-ordered insulating and an orbital-disordered metallic state.
authors.affiliation: Solid State Chemistry Laboratory, Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands.
authors.forename: Bas B
authors.initials: BB
authors.lastname: Van Aken
authors.forename: Oana D
authors.initials: OD
authors.lastname: Jurchescu
authors.forename: Auke
authors.initials: A
authors.lastname: Meetsma
authors.forename: Y
authors.initials: Y
authors.lastname: Tomioka
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura
authors.forename: Thomas T M
authors.initials: TT
authors.lastname: Palstra