Negative deviations from Matthiessen's rule for $\chem{SrRuO_3}$ and $\chem{CaRuO_3}

We have measured the change in the resistivity of thin films of $\chem{SrRuO_3}$ and $\chem{CaRuO_3}$ upon introducing point defects by electron irradiation at low temperatures, and we find significant negative deviations from Matthiessen's rule. For a fixed irradiation dose, the induced change...

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Bibliographic Details
Published in:Europhysics letters 2001-08, Vol.55 (4), p.532-538
Main Authors: Klein, L., Kats, Y., Wiser, N., Konczykowski, M., Reiner, J. W., Geballe, T. H., Beasley, M. R., Kapitulnik, A.
Format: Article
Language:English
Subjects:
72.15.-v
73.50.-h
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Summary:We have measured the change in the resistivity of thin films of $\chem{SrRuO_3}$ and $\chem{CaRuO_3}$ upon introducing point defects by electron irradiation at low temperatures, and we find significant negative deviations from Matthiessen's rule. For a fixed irradiation dose, the induced change in resistivity decreases with increasing temperature. Moreover, for a fixed temperature, the increase in resistivity with irradiation is found to be sublinear. We suggest that the observed behavior is due to the marked anisotropic scattering of the electrons together with their relatively short mean free path (both characteristic of many metallic oxides including cuprates) which amplify effects related to the Pippard ineffectiveness condition.
ISSN:0295-5075
1286-4854
DOI:10.1209/epl/i2001-00448-8