In this study, we investigate the structural, magnetic, and electronic properties of the copper-ruthenate-based oxide double perovskite ${\mathrm{La}}_{2\text{−}x}{\mathrm{Sm}}_x{\mathrm{CuRuO}}_6$ ($x$ = 0, 1, 2), synthesized by the solid-state reaction method. X-ray diffraction analysis reveals that all compounds crystallize in monoclinic symmetry, with the degree of structural distortion increasing from ${\mathrm{La}}^{3+}$ to the smaller cation ${\mathrm{Sm}}^{3+}$. Electrical resistivity studies indicate insulating behavior in all compounds, with variable-range-hopping domination at low temperatures because of the presence of antisite disorder. AC susceptibility and heat capacity measurements suggest suppression of frustration in Sm-bearing compounds, affecting the magnetic behavior. Our first-principles calculations suggest that the combined effects of lattice distortion and Sm magnetism play a crucial role in weakening magnetic frustration, thereby rationalizing the experimental observations. These findings shed light on the complex interplay of crystal structure and magnetism in Cu-Ru double perovskites and open up an avenue for tuning magnetic properties through rare-earth-ion substitution.

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• Magnetic order
• Perovskites
• Spin glasses
• Density functional theory
• X-ray powder diffraction