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Nodes in the order parameter of superconducting iron pnictides investigated by infrared spectroscopy (CROSBI ID 145072)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Wu, D. ; Barišić, Neven ; Dressel, M. ; Cao G.H. ; Xu, Z. A. ; Carbotte, J.P. ; Schachinger, E. Nodes in the order parameter of superconducting iron pnictides investigated by infrared spectroscopy // Physical review. B, Condensed matter and materials physics, 82 (2010), 184527-1-184527-5. doi: 10.1103/PhysRevB.82.184527

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

Povezanost rada

Fizika

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