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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
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
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Publisher
University of Wyoming. Libraries
Research Projects
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Keywords
Physical Sciences and Mathematics