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Electron doping of a 122-type iron pnictide BaFe2As2 by substituting the Basite with an aliovalent ion (indirect doping), which had been unsuccessful byconventional solid-state synthesis methods, was achieved by a non-equilibriumfilm growth process. The substitution with La was substantiated by a systematicshrinkage of the c-axis lattice parameter due to the smaller ionic radius ofLa3+ than that of Ba2+. A negative Hall coefficient indicated that the majoritycarriers were electrons, as is consistent with this aliovalent ion doping. TheLa substitution suppressed an antiferromagnetic transition and induced bulksuperconductivity at a maximum onset critical temperature (Tc) of 22.4 K. Theelectronic phase diagram for (Ba1-xLax)Fe2As2 was built, which revealed thatthe indirect electron doping at the Ba site with La [(Ba1-xLax)Fe2As2] exhibitsalmost the same Tc - doping level relation as that of the directelectron-doping at the Fe site with Co [Ba(Fe1-xCox)2As2]. This findingclarified that Tc in 122-type compounds is not affected by a crystallographicdoping site, which is in sharp contrast to the 1111-type compounds, REFeAsO (RE= rare earth). It is tentatively attributed to the differences in theirdimensionality of electronic structures and electron pairing symmetries.

Identical effects of indirect and direct electron doping of superconducting BaFe2As2 thin films