Abstract
Using high-resolution, lifetime removed, x-ray absorption spectroscopy at the As edge, we evidence the strong sensitivity of the As electronic structure upon electron doping with Co or pressure change in , at room temperature. Our results unravel the prominent role played by As- orbitals in the electronic properties of the Fe pnictide superconductors. We propose a unique picture to describe the overall effect of both external parameter doping and pressure, resolving the apparent contradiction between angle-resolved photoemission spectroscopy, transport, and absorption results, with the As- states as a key ingredient.
- Received 15 July 2014
DOI:https://doi.org/10.1103/PhysRevLett.114.177001
© 2015 American Physical Society