Site dilution and charge disorder effect on physical properties in SrRu_1-x Ga _x O₃

Here, we report an evolution of structural, magnetic and transport behavior in doped SrRu_1-x Ga _x O₃ (x [Formula: see text] 0.2). The nonmagnetic dopant Ga³⁺ (3d ¹⁰) not only acts for magnetic site dilution in SrRuO₃ but also modifies the Ru charge state and electronic density. Our studies show that Ga³⁺ substitution does not affect the original orthorhombic- Pbnm structure of SrRuO₃ which is due to its matching ionic radii with Ru⁴⁺ . However, Ga³⁺ has a substantial effect on the magnetic behavior of SrRuO₃ 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 Ga³⁺ induces an insulating state in SrRuO₃ 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 SrRuO₃ 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.