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Giant negative magnetoresistance of spin polarons in magnetic semiconductors–chromium-doped Ti2O3 thin films
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Wang, Zhenjun, Hong, Yuanjia, Tang, Jinke, Radu, Cosmin, Chen, Y. (Yuxi), Spinu, Leonard, Zhou, Weilie and Tung, Le Duc (2005) Giant negative magnetoresistance of spin polarons in magnetic semiconductors–chromium-doped Ti2O3 thin films. Applied Physics Letters, Vol.86 (No.8). 082509. doi:10.1063/1.1874302 ISSN 0003-6951.
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Official URL: http://dx.doi.org/10.1063/1.1874302
Abstract
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.
Item Type: | Journal Article | ||||
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Subjects: | T Technology > TK Electrical engineering. Electronics Nuclear engineering Q Science > QC Physics |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | Titanium compounds, Chromium compounds, Magnetoresistance, Ferromagnetic materials, Semiconductors | ||||
Journal or Publication Title: | Applied Physics Letters | ||||
Publisher: | American Institute of Physics | ||||
ISSN: | 0003-6951 | ||||
Official Date: | 18 February 2005 | ||||
Dates: |
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Volume: | Vol.86 | ||||
Number: | No.8 | ||||
Page Range: | 082509 | ||||
DOI: | 10.1063/1.1874302 | ||||
Status: | Peer Reviewed | ||||
Access rights to Published version: | Open Access (Creative Commons) | ||||
Funder: | Sharp Laboratories of America (SLA), Louisiana Board of Regents. Support Fund (BoRSF) | ||||
Grant number: | LEQSFs2004-07d-RD-B-12 (BoRSF) |
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