Abstract
The effect of Fe substitution in the bad metal SrRuO 3 perovskite was studied by resistivity, magnetic susceptibility and Mössbauer spectroscopic measurements. The conduction behavior changed from metallic for x Fe≤0.1 to non-metallic for x Fe>0.26. In the intermediate concentration range, 0.1< x Fe<0.26, a resistivity minimum was observed as a function of temperature. The magnetic properties showed a change from ferromagnetic to paramagnetic for x Fe≥0.3. There was an enhancement in quadrupole splitting deduced from 57Fe Mössbauer spectra in going from compositions x Fe<0.3 to x Fe≥0.3 suggestive of a change in screening of ionic charge at this composition. These observations show that the change in conduction behavior of this system may be related to the initial small mean free path of the bad metal system as well as a change in conduction electron density brought about by substitution of trivalent Fe for quadruvalent Ru.
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