Surface and bulk electronic structures of LaOFeAs studied by angle resolved photoemission spectroscopy

Abstract

The electronic structure of LaOFeAs, a parent compound of iron-arsenic superconductors, is studied by angleresolved photoemission spectroscopy. By examining its dependence on photon energy, polarization, sodium dosing and the counting of Fermi surface volume, both the bulk and the surface contributions are identified. We find that a bulk band moves toward high binding energies below structural transition, and shifts smoothly across the spin density wave transition by about 25 meV. Our data suggest the band reconstruction may play a crucial role in the spin density wave transition, and the structural transition is driven by the short range magnetic order. For the surface states, both the LaO-terminated and FeAs-terminated components are revealed. Certain small band shifts are verified for the FeAs-terminated surface states in the spin density wave state, which is a reflection of the bulk electronic structure reconstruction. Moreover, sharp quasiparticle peaks quickly rise at low temperatures, indicating of drastic reduction of the scattering rate. A kink structure in one of the surface band is shown to be possibly related to the electron-phonon interactions.

9 pages, 8 figures

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• Unified phase diagram for iron-based superconductors
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• Spectral properties of transition metal pnictides and chalcogenides: angle-resolved photoemission spectroscopy and dynamical mean field theory
• Quasiparticle interference of C2-symmetric surface states in LaOFeAs parent compound
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• Angle-resolved photoemission spectroscopy study of PrFeAsO_{0.7}: Dependence of the electronic structure on the pnictogen height
• Impurity-induced quasiparticle interference in the parent compounds of iron-pnictide superconductors
• Presence of magnetic excitations in SmFeAsO
• Ground state pairing correlations in the $S_4$ symmetric microscopic model for iron-based superconductors
• Multiple-pseudogap phases in hydrogen-doped LaFeAsO system
• Intertwined Spin and Orbital Density Waves in MnP Uncovered by Resonant Soft X-ray Scattering
• Lattice dynamics in the double-helix antiferromagnet FeP
• Disentangling the surface and bulk electronic structures of LaOFeAs
• Strong surface termination dependence of the electronic structure of polar superconductor LaFeAsO revealed by nano-ARPES
• Revealing the intrinsic superconducting gap anisotropy in surface-neutralized BaFe${}_2$(As${}_{0.7}$P${}_{0.3}$)${}_2$
• Observation of the bands with $d_{xy}$ orbital character near the Fermi level in NdFeAs${}_{1-x}$P${}_x$O${}_{0.9}$F${}_{0.1}$ using angle-resolved photoemission spectroscopy
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• Temperature and doping dependence of normal state spectral properties in a two-orbital model for ferropnictides