Abstract
The electronic structure of LaFeAsO, a parent compound of iron-arsenic superconductors, is studied by angle-resolved photoemission spectroscopy. By examining its dependence on photon energy, polarization, and sodium dosing, both the bulk and the surface contributions are identified. We find that a bulk band moves toward high binding energies below the structural transition temperature, and shifts smoothly across the spin-density-wave transition by about 25 meV. Our data suggest that the band reconstruction may play a crucial role in the spin-density-wave and the structural transitions. For the surface states, both the LaO-terminated and FeAs-terminated components are revealed. Certain small band shifts are observed for the FeAs-terminated surface states in the spin-density-wave state, which might be a reflection of the bulk electronic-structure reconstruction. Moreover, sharp quasiparticle peaks quickly rise at low temperatures, indicating drastic reduction in the scattering rate. A kink structure in one of the surface band is shown to be possibly related to the enhanced electron-phonon interactions on the polar surface.
Published in:
Physical Review B 82,10 (2010)
Link to original published article:
http://dx.doi.org/10.1103/PhysRevB.82.104519
Date of Version
September 2010
Recommended Citation
Yang, L. X.; Xie, B. P.; Zhang, Y.; He, C.; Ge, Q. Q.; Wang, X. F.; Chen, X. H.; Arita, M.; Jiang, J.; Shimada, K.; Taniguchi, M.; Vobornik, I.; Rossi, G.; Hu, J. P.; Lu, D. H.; Shen, Z. X.; Lu, Z. Y.; and Feng, D. L., "Surface and bulk electronic structures of LaFeAsO studied by angle-resolved
photoemission spectroscopy" (2010). Department of Physics and Astronomy Faculty Publications. Paper 1350.
https://docs.lib.purdue.edu/physics_articles/1350