Angle-resolved photoemission spectroscopy study of PrFeAsO0.7: Comparison with LaFePO

We have performed an angle-resolved photoemission spectroscopy (ARPES) study of the iron-based superconductor PrFeAsO0.7 and examined the Fermi surfaces and band dispersions near the Fermi level. Heavily hole-doped electronic states have been observed due to the polar nature of the cleaved surfaces. Nevertheless, we have found that the ARPES spectra basically agree with band dispersions calculated in the local density approximation (LDA) if the bandwidth is reduced by a factor of similar to 2.5 and then the chemical potential is lowered by similar to 70 meV. Comparison with previous ARPES results on LaFePO reveals that the energy positions of the d(3z2-r2)- and d(yz,zx)-derived bands are considerably different between the two materials, which we attribute to the different pnictogen height as predicted by the LDA calculation.