title: Intrinsic colossal magnetoresistance effect in thin-film Pr0.5Sr0.5MnO3 through dimensionality switching.
abstract: A homogeneous colossal magnetoresistance (CMR) effect at low temperatures has been found in a thin-film perovskite manganite Pr0.5Sr0.5MnO3. The transition is driven not by the spin alignment as in usual CMR in bulk samples but by the localization-delocalization transition switched by the change in the effective dimensionality. Two-dimensional (x2-y2)-orbital ordering enhanced by the substrate strain is essential for the stabilization of the insulating localized state, which is on the verge of the first-order transition to the three-dimensional metallic ferromangetic state.
authors.affiliation: Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Uozu
authors.forename: Y
authors.initials: Y
authors.lastname: Wakabayashi
authors.forename: Y
authors.initials: Y
authors.lastname: Ogimoto
authors.forename: N
authors.initials: N
authors.lastname: Takubo
authors.forename: H
authors.initials: H
authors.lastname: Tamaru
authors.forename: N
authors.initials: N
authors.lastname: Nagaosa
authors.forename: K
authors.initials: K
authors.lastname: Miyano