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

Zhenjun Wang; Yuanjia Hong; Jinke Tang; Cosmin Radu; Yuxi Chen; Leonard Spinu; Weilie Zhou; Le Duc Tung
February 2005
Applied Physics Letters;2/21/2005, Vol. 86 Issue 8, p082509
Academic Journal
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.


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