Journal
PHYSICAL REVIEW B
Volume 86, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.86.060516
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Funding
- German Research Foundation (DFG) [SPP1458, JO257/6-1]
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The recently discovered compounds Ca-10(Fe1-xPtxAs)(10)(Pt3+yAs8) exhibit superconductivity up to 38 K, and contain iron arsenide (FeAs) and platinum arsenide (Pt3+yAs8) layers separated by layers of calcium atoms. We show that T-c > 15 K only emerges by electron doping of pure FeAs layers, and not by platinum substitution in (Fe1-xPtx) As layers, as anticipated so far. Indeed, two different negatively charged layers [(FeAs)(10)](n-) and (Pt3+yAs8)(m-) compete for the electrons provided by the Ca2+ ions. The charge between the layers is formally balanced to (FeAs)(1-) in the parent compound Ca-10(FeAs)(10)(Pt3As8), and superconductivity emerges by electron doping if this balance is shifted. The latter is achieved either by adding electrons as in (Ca0.8La0.2)(10)(FeAs)(10)(Pt3As8) (T-c = 30 K), or intrinsically in Ca-10(FeAs)(10)(Pt4As8) (T-c approximate to 38 K), where the Pt4As8 layer itself provides extra electrons.
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