Role of different negatively charged layers in Ca10(FeAs)10(Pt4As8) and superconductivity at 30 K in electron-doped (Ca0.8La0.2)10(FeAs)10(Pt3As8)
Tobias Stürzer, Gerald Derondeau, Dirk Johrendt
DOI 10.1103/PhysRevB.86.060516 · Physical Review B
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Abstract
The recently discovered compounds Ca10(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 Tc>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 Ca10(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) (Tc=30 K), or intrinsically in Ca10(FeAs)10(Pt4As8) (Tc≈38 K), where the Pt4As8 layer itself provides extra electrons.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ca10(FeAs)10(Pt4As8) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | onset |
| (Ca0.8La0.2)10(FeAs)10(Pt3As8) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 30 | Pressure not reported | onset |
| Ca10(FeAs)10(Pt3As8) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15 | Pressure not reported | onset |
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