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The effects of aliovalent rare earth substitution on the physical propertiesof Sr0.3Ca0.7Fe2As2 solid solutions are explored. Electrical transport,magnetic susceptibility and structural characterization data as a function ofLa substitution into (Sr_1-y_Ca_y)_1-x_La_x_Fe2As2 single crystals confirm theability to suppress the antiferromagnetic ordering temperature from 200 K inthe undoped compound down to 100 K approaching the solubility limit of La.Despite up to ~30% La substitution, the persistence of magnetic order and lackof any signature of superconductivity above 10 K present a contrasting phasediagram to that of Ca1-xLaxFe2As2, indicating that the suppression of magneticorder is necessary to induce the high-temperature superconducting phaseobserved in Ca1-xLaxFe2As2.

Rare earth substitution in lattice-tuned Sr0.3Ca0.7Fe2As2 solid solutions