Nodes in the order parameter of superconducting iron pnictides investigated by infrared spectroscopy (CROSBI ID 145072)
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Podaci o odgovornosti
Wu, D. ; Barišić, Neven ; Dressel, M. ; Cao G.H. ; Xu, Z. A. ; Carbotte, J.P. ; Schachinger, E.
engleski
Nodes in the order parameter of superconducting iron pnictides investigated by infrared spectroscopy
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 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.
PACS numbers: 74.25.Gz; 74.70.Xa; 74.20.Rp; 74.20.Mn
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Podaci o izdanju
82
2010.
184527-1-184527-5
objavljeno
1098-0121
10.1103/PhysRevB.82.184527