Site dilution and charge disorder effect on physical properties in SrRu Ga O.

Here, we report an evolution of structural, magnetic and transport behavior in doped SrRu Ga O (x [Formula: see text] 0.2). The nonmagnetic dopant Ga (3d ) not only acts for magnetic site dilution in SrRuO but also modifies the Ru charge state and electronic density. Our studies show that Ga substitution does not affect the original orthorhombic- Pbnm structure of SrRuO which is due to its matching ionic radii with Ru . However, Ga has a substantial effect on the magnetic behavior of SrRuO where it decreases both magnetic moment as well as magnetic transition temperature [Formula: see text]. Further, this dilution induces Griffiths phase behavior across [Formula: see text] and cluster-glass behavior at low temperature with higher concentration of doping. The magnetic critical exponent [Formula: see text] increases with x due to this site dilution effect. The Ga induces an insulating state in SrRuO with x  >  0.05. The charge transport in paramagnetic as well as in insulating state of samples can be well described with Mott's modified variable-range-hopping model. The metallic charge transport just below [Formula: see text] in SrRuO obeys Fermi liquid behavior which breaks down at low temperature. We further find a correlation between field dependent magnetoresistance and magnetization through power-law behavior over the series.