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

By Zhenjun Wang, Yuanjia Hong, Jinke Tang, Cosmin Radu, Y. (Yuxi) Chen, Leonard Spinu, Weilie Zhou and Le Duc Tung


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, rho= rho0 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

Topics: TK, QC
Publisher: American Institute of Physics
Year: 2005
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