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The recently discovered compounds Ca10(Fe1-xPtxAs)10(Pt3+yAs8) exhibitsuperconductivity up to 38 K, and contain iron arsenide (FeAs) and platinumarsenide (Pt3+yAs8) layers separated by layers of Ca atoms. We show that highTc's above 15 K only emerge if the iron-arsenide layers are at most free ofplatinum-substitution (x \rightarrow 0) in contrast to recent reports. In factPt-substitution is detrimental to higher Tc, which increases up to 38 K only bycharge doping of pure FeAs layers. We point out, that two different negativelycharged layers [(FeAs)10]n- and (Pt3+yAs8)m- compete for the electrons providedby the Ca2+ ions, which is unique in the field of iron-based superconductors.In the parent compound Ca10(FeAs)10(Pt3As8), no excess charge dopes theFeAs-layer, and superconductivity has to be induced by Pt-substitution, albeitbelow 15 K. In contrast, the additional Pt-atom in the Pt4As8layer shifts thecharge balance between the layers equivalent to charge doping by 0.2 electronsper FeAs. Only in this case Tc raises to 38 K, but decreases again ifadditionally platinum is substituted for iron. This charge doping scenario issupported by our discovery of superconductivity at 30 K in the electron-dopedLa-1038 compound (Ca0.8La0.2)10(FeAs)10(Pt3As8) without significantPt-substitution.

physical review. b, condensed matter and materials physics

The role of different negatively charged layers in  Ca10(Fe1-xPtxAs)10(Pt3+yAs8) and superconductivity at 30 K in electron-doped  (Ca0.8La0.2)10(FeAs)10(Pt3As8)