Site dilution and charge disorder effect on physical properties in SrRu${}_{1-x}$Ga${}_x$O${}_3$

Abstract

Here, we report an evolution of structural, magnetic and transport behavior in doped SrRu${}_{1-x}$Ga${}_x$O${}_3$ ($x$ $\le$ 0.2). The nonmagnetic dopant Ga${}^{3+}$ (3$d^{10}$) not only acts for magnetic site dilution in SrRuO${}_3$ but also it modifies the Ru charge state and electronic density. Our studies show that Ga${}^{3+}$ substitution does not affect the original orthorhombic-\textit{Pbnm} structure of SrRuO${}_3$ which is due to its matching ionic radii with Ru${}^{4+}$. However, Ga${}^{3+}$ has a substantial effect on the magnetic behavior of SrRuO${}_3$ where it decreases both magnetic moment as well as magnetic transition temperature $T_c$. Further, this dilution induces Griffiths phase behavior across $T_c$ and cluster-glass behavior at low temperature with higher concentration of doping. The magnetic critical exponent $\beta$ increases with $x$ due to this site dilution effect. The Ga${}^{3+}$ induces an insulating state in SrRuO${}_3$ 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 $T_c$ in SrRuO${}_3$ obeys Fermi liquid behavior which, however breaks down at low temperature. We further find a correlation between field dependent magnetoresistance and magnetization through power-law behavior over the series.

12 figures, To appear in JPCM

References in corpus (3)

• Ferromagnetic cluster spin-glass behavior in PrRhSn3
• Electric-field control of anomalous and topological Hall effects in oxide bilayer thin films
• Evolution of a band insulating phase from a correlated metallic phase

Cited by in corpus (1)

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