E. Burstein
Ferroelectrics
Resistivity measurements and x-ray absorption near-edge structure spectroscopy were performed on single crystals of 0.2 mol % Cr-doped SrTiO3, which exhibit an electrical-field-induced insulator-to-conductor transition with a resistive memory effect. The electrically conducting state is shown to be metallic. The insulator-to-metal transition is accompanied by an increase of the Cr valence underneath the anode from Cr3+ to approximately Cr4+. This indicates that the insulator-to-metal transition is associated with internal doping due to a change of the Cr valence, thereby providing free carriers to the Ti 3d band. © 2005 The American Physical Society.
E. Burstein
Ferroelectrics
U. Wieser, U. Kunze, et al.
Physica E: Low-Dimensional Systems and Nanostructures
A. Gangulee, F.M. D'Heurle
Thin Solid Films
Julian J. Hsieh
Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films