Abstract
The electronic structure of electron-doped iron-arsenide superconductors has been measured with angle-resolved photoemission spectroscopy. The data reveal a marked photon energy dependence of points in momentum space where the bands cross the Fermi energy, a distinctive and direct signature of three dimensionality in the Fermi-surface topology. By providing a unique example of high-temperature superconductivity hosted in layered compounds with three-dimensional electronic structure, these findings suggest that the iron arsenides are unique materials, quite different from the cuprates high-temperature superconductors.
- Received 4 February 2009
DOI:https://doi.org/10.1103/PhysRevB.79.220503
©2009 American Physical Society