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The perovskite solid solutions of the typeLa$_{2x}$Sr$_{2-2x}$Co$_{2x}$Ru$_{2-2x}$O$_{6}$ with 0.25 $\leq$ x $ \leq $0.75 have been investigated for their structural, magnetic and transportproperties. All the compounds crystallize in double perovskite structure. Themagnetization measurements indicate a complex magnetic ground state with strongcompetition between ferromagnetic and antiferromagnetic interactions.Resistivity of the compounds is in confirmation with hopping conductionbehaviour though differences are noted especially for $x$ = 0.4 and 0.6. Mostimportantly, low field (50Oe) magnetization measurements display negativemagnetization during the zero field cooled cycle. X-ray photoelectronspectroscopy measurements indicate presence of Co$^{2+}$/Co$^{3+}$ andRu$^{4+}$/Ru$^{5+}$ redox couples in all compositions except $x$ = 0.5.Presence of magnetic ions like Ru$^{4+}$ and Co$^{3+}$ gives rise to additionalferromagnetic (Ru-rich) and antiferromagnetic sublattices and also explains theobserved negative magnetization.

Structure, Transport and Magnetic properties in La$_{2x}$Sr$_{2-2x}$Co$_{2x}$Ru$_{2-2x}$O$_{6}$