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Compounds of Sr1-xLaxFe2As2 were synthesized by solid state reaction at 1273K, under pressures of 2 or 3 GPa. The Sr1-xLaxFe2As2 phase was dominant up to x= 0.5, and superconductivity was observed at $x \ge 0.2$. A maximum criticaltemperature Tc of 22 K, and a maximum shielding volume fraction of ~70 % wereobtained at x = 0.4. This is the first experimental demonstration ofelectron-doped superconductivity in 122-type iron pnictides, where electronswere doped through aliovalent substitution at the site of the alkaline earthmetal. The optimal Tc was slightly higher than that for the Co-doped (directlyelectron-doped) samples (19 K), and much lower than that for the hole-dopedcase (37 K). The bulk superconductivity range was narrower than that for theCo-substituted case, and both ranges were much narrower than that for thehole-doped case. These observations revealed that differences in theelectron-doping mode (direct or indirect) did not have a prominent effect onthe optimal Tc or superconductivity range, compared with differences in carrierpolarity.

High Pressure Synthesis of Indirectly electron-doped 122 Iron Superconductor Sr1-xLaxFe2As2 with a maximum Tc = 22 K