Phys. Rev. Lett. 101, 147003 (2008) [4 pages]Momentum Dependence of the Superconducting Gap in NdFeAsO0.9F0.1 Single Crystals Measured by Angle Resolved Photoemission SpectroscopyReceived 6 July 2008; published 2 October 2008 We use angle resolved photoemission spectroscopy to study the momentum dependence of the superconducting gap in NdFeAsO0.9F0.1 single crystals. We find that the Γ hole pocket is fully gapped below the superconducting transition temperature. The value of the superconducting gap is 15±1.5 meV and its anisotropy around the hole pocket is smaller than 20% of this value—consistent with an isotropic or anisotropic s-wave symmetry of the order parameter. This is a significant departure from the situation in the cuprates, pointing to the possibility that the superconductivity in the iron arsenic based system arises from a different mechanism. © 2008 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.101.147003
DOI:
10.1103/PhysRevLett.101.147003
PACS:
74.70.−b, 74.25.Jb, 79.60.−i
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