Document Type

Article

Publication Date

5-15-2002

Abstract

Small CrO2 particles with mean diameters ranging from 11 to 25 nm have been prepared by ball milling. X-ray diffraction studies show a continuous lattice expansion with increasing milling time. A phase transition to Cr2O3 also occurs with a sudden increase in the amount of Cr2O3 found between 5 and 8 h of milling. The decreases of low-field magnetoresistance with increasing milling time is correlated to the expansion of the lattice parameters of CrO2 , which probably leads to the reduction in its spin polarization. High-field magnetoresistance increases with the milling possibly due to the enhanced mixed valence of the chromium, which supports the double exchange model. © 2002 American Institute of Physics.

DOI

10.1063/1.1449451

Comments

Copyright 2002 AIP (American Institute of Physics) Publishing LLC.

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