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Giant negative magnetoresistance of spin polarons in magnetic semiconductors–chromium-doped Ti2O3 thin films

Wang, Zhenjun
Hong, Yuanjia
Tang, Jinke
Radu, Cosmin
Chen, Yuxi
Spinu, Leonard
Zhou, Weilie
Tung, Le Duc
Abstract
Description
Epitaxial Cr-doped Ti2O3 films show giant negative magnetoresistance up to −365% at 2 K. The resistivity of the doped samples follows the behavior expected of spin (magnetic) polarons at low temperature. Namely, ρ=ρ0 exp(T0 /T)p, where p=0.5 in zero field. A large applied field quenches the spin polarons and p is reduced to 0.25 expected for lattice polarons. The formation of spin polarons is an indication of strong exchange coupling between the magnetic ions and holes in the system.
Date
2005-02-18
Journal Title
Journal ISSN
Volume Title
Publisher
University of Wyoming. Libraries