Enhancing the three-dimensional electronic structure in 1111-type iron arsenide superconductors by H substitution
Yoshinori Muraba, Satoru Matsuishi, Hideo Hosono
DOI 10.1103/PhysRevB.89.094501 · Physical Review B
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Abstract
The 1111-type iron arsenide hydride CaFe1−xCoxAsH was synthesized by high-pressure solid-state reaction, and its electronic structure and superconducting properties were investigated. Bulk superconductivity was observed at x = 0.09–0.26. A maximum superconducting critical temperature (Tcmax) of 23 K was observed at x = 0.09. These values are in agreement with those of CaFe1−xCoxAsF. The calculated Fermi surface of CaFeAsH has a small three-dimensional (3D) hole pocket around the Γ point. This is a result of weak covalent bonding between the As 4p and H 1s orbitals. No such covalency exists in CaFeAsF, because the energy level of the F 2p orbital is sufficiently deep to inhibit overlap with the As 4p orbital. The similar superconductivities of CaFe1−xCoxAsH and CaFe1−xCoxAsF are explained with the nesting scenario. The small 3D hole pocket of CaFe1−xCoxAsH does not significantly contribute to electron excitation. These findings encourage exploration of hydrogen-containing 1111-type iron-based materials with lower anisotropies and higher Tc applicable to superconducting wires and tapes.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaFe1-xCoxAsH Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | onset |
| CaFe1-xCoxAsH Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | onset |
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| CaFe1-xCoxAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23 | Pressure not reported | onset |
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