Volume 85, Number 6, March 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||30 March 2009|
Superconducting gap symmetry of Ba0.6K0.4Fe2As2 studied by angle-resolved photoemission spectroscopy
Department of Physics, Tohoku University - Sendai 980-8578, Japan
2 TRIP, Japan Science and Technology Agency (JST) - Kawaguchi 332-0012, Japan
3 WPI Research Center, Advanced Institute for Materials Research, Tohoku University - Sendai 980-8577, Japan
4 Department of Physics, Boston College - Chestnut Hill, MA 02467, USA
5 Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences Beijing 100080, China
Corresponding author: email@example.com
Accepted: 21 February 2009
We have performed high-resolution angle-resolved photoemission spectroscopy on the optimally doped Ba0.6K0.4Fe2As2 compound and determined the accurate momentum dependence of the superconducting (SC) gap in four Fermi-surface sheets including a newly discovered outer electron pocket at the M-point. The SC gap on this pocket is nearly isotropic and its magnitude is comparable (Δ ~ 11 meV) to that of the inner electron and hole pockets (~ 12 meV), although it is substantially larger than that of the outer hole pocket (~ 6 meV). The Fermi-surface dependence of the SC gap value is basically consistent with the formula expected for the extended s-wave symmetry. The observed finite deviation from the simple formula suggests the importance of multi-orbital effects.
PACS: 74.25.Jb – Electronic structure / 74.70.-b – Superconducting materials / 79.60.-i – Photoemission and photoelectron spectra
© EPLA, 2009
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