Physics – Condensed Matter – Superconductivity
Scientific paper
2010-07-28
Phys. Rev. B 82, 184527 (2010)
Physics
Condensed Matter
Superconductivity
11 pages, 3 figures
Scientific paper
The temperature and frequency dependences of the conductivity are derived from optical reflection and transmission measurements of electron doped BaFe$_2$As$_2$ crystals and films. The data is consistent with gap nodes or possibly a very small gap 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 canceling 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 $\Gamma$ 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.
Barišić Neven
Cao G.-H.
Carbotte Jules P.
Dressel Martin
Schachinger Ewald
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