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29 March 2024 |
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Article overview
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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 | Abstract: | 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. | Source: | arXiv, 1007.5215 | Services: | Forum | Review | PDF | Favorites |
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