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

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journal contribution
posted on 15.11.2021, 21:34 by Zhenjun Wang, Yuanjia Hong, Jinke Tang, Cosmin Radu, Yuxi Chen, Leonard Spinu, Weilie Zhou, 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, 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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eng

Language

English

Publisher

University of Wyoming. Libraries

Journal title

APPLIED PHYSICS LETTERS

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Faculty Publications - Physics and Astronomy

Department

  • Library Sciences - LIBS

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