Electronic Properties of BaFe$_2$As$_2$ upon Doping and Pressure: The Prominent Role of the As $\it p$ Orbitals

V. Balédent (1) , F. Rullier-Albenque (2) , D. Colson (2) , J. m. Ablett (3) , J.-P. Rueff (3, 4)

1 LPS - Laboratoire de Physique des Solides
2 LNO - Laboratoire Nano-Magnétisme et Oxydes
3 SSOLEIL - Synchrotron SOLEIL
4 LCPMR - Laboratoire de Chimie Physique - Matière et Rayonnement

Using high-resolution, lifetime removed, x-ray absorption spectroscopy at the As $\it K$ edge, we evidence the strong sensitivity of the As electronic structure upon electron doping with Co or pressure change in BaFe$_2$As$_2$ at room temperature. Our results unravel the prominent role played by As$\it 4p$ 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$\it p$ states as a key ingredient

Domains: Physics [physics]

V. Balédent, F. Rullier-Albenque, D. Colson, J. m. Ablett, J.-P. Rueff. Electronic Properties of BaFe$_2$As$_2$ upon Doping and Pressure: The Prominent Role of the As $\it p$ Orbitals. Physical Review Letters, 2015, 114, pp.177001. ⟨10.1103/PhysRevLett.114.177001⟩. ⟨cea-01494131⟩