Deviations from Matthiessen's Rule for ${\rm SrRuO_3}$ and ${\rm CaRuO_3}$

Details Deviations from Matthiessen's Rule for ${\rm SrRuO_3}$ and ${\rm CaRuO_3}$ Deviations from Matthiessen's Rule for ${\rm SrRuO_3}$ and ${\rm CaRuO_3}$

2000-11-22

arxiv.org/abs/cond-mat/0011376v1

Europhys. Lett. 55, 532 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1209/epl/i2001-00448-8

We have measured the change in the resistivity of thin films of ${\rm SrRuO_3}$ and ${\rm CaRuO_3}$ upon introducing point defects by electron irradiation at low temperatures, and we find significant deviations from Matthiessen's rule. For a fixed irradiation dose, the induced change in resistivity {\it decreases} with increasing temperature. Moreover, for a fixed temperature, the increase in resistivity with irradiation is found to be {\it 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.

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