Charge dynamics in the normal state of the iron oxypnictide   superconductor LaFePO
  We present the first infrared and optical study in the normal state of ab-plane oriented single crystals of the iron-oxypnictide superconductor LaFePO. We find that this material is a low carrier density metal with a moderate level of correlations and exhibits signatures of electron-boson coupling. The data is consistent with the presence of coherent quasiparticles in LaFePO. 
M. M. Qazilbash, J. J. Hamlin, R. E. Baumbach, M. B. Maple, and D. N.   Basov