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29 March 2024
 
  » arxiv » 1007.5215

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Nodes in the Order Parameter of Superconducting Iron Pnictides Observed by Infrared Spectroscopy
D.Wu ; N. Barisic ; M. Dressel ; G. H. Cao ; Z. A. Xu ; J. P. Carbotte ; E. Schachinger ;
Date 28 Jul 2010
AbstractThe 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.
Source arXiv, 1007.5215
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