Evidence for a gap in the excitation spectrum of CrO2

Magnetization and resistivity of CrO2 powders and oriented CrO2 films on different TiO2 single-crystal substrates are reported, and the low-temperature specific heat is measured on powders. The M(T) data follow a Bloch T3/2 law, with no sign of a spin-wave gap. The residual resistivity depends stron...

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Bibliographic Details
Published in:Journal of applied physics 1998-06, Vol.83 (11), p.7166-7168
Main Authors: Barry, A., Coey, J. M. D., Ranno, L., Ounadjela, K.
Format: Article
Language:English
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Summary:Magnetization and resistivity of CrO2 powders and oriented CrO2 films on different TiO2 single-crystal substrates are reported, and the low-temperature specific heat is measured on powders. The M(T) data follow a Bloch T3/2 law, with no sign of a spin-wave gap. The residual resistivity depends strongly on film texture, but a T2 temperature dependence of the resistivity is found in all samples above a cut-off temperature of the order of 70 K. The behavior is attributed to electron-magnon spin-flip scattering which is suppressed at low temperature in a half-metallic ferromagnet.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.367791