Unusual Pseudogap-like Features Observed in Iron Oxypnictide Superconductors

Details Unusual Pseudogap-like Features Observed in Iron Oxypnictide Superconductors Unusual Pseudogap-like Features Observed in Iron Oxypnictide Superconductors

2008-05-17

arxiv.org/abs/0805.2647v2

Phys. Rev. B 79, 060503(R) (2009)

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevB.79.060503

We have performed a temperature-dependent angle-integrated laser photoemission study of iron oxypnictide superconductors LaFeAsO:F and LaFePO:F exhibiting critical transition temperatures (Tc's) of 26 K and 5 K, respectively. We find that high-Tc LaFeAsO:F exhibits a temperature-dependent pseudogap-like feature extending over ~0.1 eV about the Fermi level at 250 K, whereas such a feature is absent in low-Tc LaFePO:F. We also find ~20-meV pseudogap-like features and signatures of superconducting gaps both in LaFeAsO:F and LaFePO:F. We discuss the possible origins of the unusual pseudogap-like features through comparison with the high-Tc cuprates.

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