Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 469, Issue 9-12, Pages 452-458Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physc.2009.03.044
Keywords
Electronic structure; Fermi surface; Photoemission; Iron pnictides
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Funding
- DOE Office of Basic Energy Science, Division of Materials Science and Engineering [DE-AC02-76SF00515]
- NSF
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We report a comparison study of LaOFeP and LaOFeAs, two parent compounds of recently discovered iron-pnictide superconductors, using angle-resolved photoemission spectroscopy. Both systems exhibit some common features that are very different from well-studied cuprates. In addition, important differences have also been observed between these two ferrooxypnictides. For LaOFeP, quantitative agreement can be found between our photoemission data and the LDA band structure calculations, suggesting that a weak coupling approach based on an itinerant ground state may be more appropriate for understanding this new superconducting compound. In contrast, the agreement between LDA calculations and experiments in LaOFeAs is relatively poor, as highlighted by the unexpected Fermi surface topology around (pi, pi). Further investigations are required for a comprehensive understanding of the electronic structure of LaOFeAs and related compounds. (C) 2009 Elsevier B.V. All rights reserved.
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