Naslov
Nodes in the order parameter of superconducting iron pnictides investigated by infrared spectroscopy

Autori
Wu, D. ; Barišić, Neven ; Dressel, M. ; Cao G.H. ; Xu, Z. A. ; Carbotte, J.P. ; Schachinger, E.

Izvornik
Physical Review B - Condensed Matter and Materials Physics (1098-0121) 82 (2010); 184527-1

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
PACS number
s: 74.25.Gz; 74.70.Xa; 74.20.Rp; 74.20.Mn

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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