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Momentum dependence of the superconducting gap in NdFeAsO1-xFx single crystals measured by angle resolved photoemission spectroscopy

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arxiv 0807.0815 v1 pith:ZJS53JJD submitted 2008-07-06 cond-mat.supr-con

Takeshi Kondo , A. F. Santander-Syro , O. Copie , Chang Liu , M. E. Tillman , E. D. Mun , J. Schmalian , S. L. Bud'ko
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M. A. Tanatar P. C. Canfield A. Kaminski
This is my paper · ORCID
classification cond-mat.supr-con
keywords superconductinganglecrystalsdependenceholemomentumndfeaso1-xfxphotoemission
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We use angle resolved photoemission spectroscopy (ARPES) to study the momentum dependence of the superconducting gap in NdFeAsO1-xFx single crystals. We find that the Gamma 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. This is consistent with an isotropic or anisotropic s-wave symmetry of the order parameter or exotic d-wave symmetry with nodes located off the Fermi surface sheets. This is a significant departure from the situation in the cuprates, pointing to possibility that the superconductivity in the iron arsenic based system arises from a different mechanism.

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