Physics – Condensed Matter – Superconductivity
Scientific paper
2011-02-24
Phys. Rev. B 84, 014504 (2011)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1103/PhysRevB.84.014504
We have performed an angle-resolved photoemission spectroscopy (ARPES) study of the iron-based superconductor PrFeAsO_{0.7} 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 ~2.5 and then the chemical potential is lowered by ~70 meV. Comparison with previous ARPES results on LaFePO reveals that the energy positions of the d_{3z^2-r^2}- 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.
Arita Ryotaro
Eisaki Hiroshi
Fujimori Atsushi
Ideta S.
Ishikado Motoyuki
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