Wang, ZhenjunHong, YuanjiaTang, JinkeRadu, CosminChen, YuxiSpinu, LeonardZhou, WeilieTung, Le Duc2024-02-122024-02-122005-02-18https://wyoscholar.uwyo.edu/handle/internal/6203https://doi.org/10.15786/wyoscholar/9723Epitaxial 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.enghttps://creativecommons.org/licenses/by/4.0/Physical Sciences and Mathematicsjournal contribution10.1063/1.1874302