Intrinsic colossal magnetoresistance effect in thin-film Pr0.5Sr0.5MnO3 through dimensionality switching.
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.
Uozu
Y
Y
Department of Applied Physics, The University of Tokyo, Tokyo 113-8656, Japan.
Wakabayashi
Y
Y
Ogimoto
Y
Y
Takubo
N
N
Tamaru
H
H
Nagaosa
N
N
Miyano
K
K