Nodes in the order parameter of superconducting iron pnictides investigated by infrared spectroscopy
D. Wu, N. Barišić, M. Dressel, G. H. Cao, Z. A. Xu, J. P. Carbotte, E. Schachinger
DOI 10.1103/PhysRevB.82.184527 · Physical Review B
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Abstract
The temperature and frequency dependences of the conductivity derived from optical reflection and transmission measurements of electron-doped BaFe2As2 crystals and films are analyzed according to gap nodes or possibly a very small gap, or in the crossover region between these two possibilities. This can arise when one of the several pockets known to exist in these systems has extended s-wave gap symmetry with an anisotropic piece cancelling or nearly so the isotropic part in some momentum direction. Alternatively, a node can be lifted by impurity scattering which reduces anisotropy. We find that the smaller gap on the hole pocket at the Γ point in the Brillouin zone is isotropic s wave while the electron pocket at the M point has a larger gap which is anisotropic and falls in the crossover region.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba(Fe0.92Co0.08)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
| Ba(Fe0.95Ni0.05)2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | unknown |
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