Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
First-Principles Study of NaFeAs, NaCoAs, and NaNiAs
Koichi KusakabeAkitaka Nakanishi
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2009 Volume 78 Issue 12 Pages 124712

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Abstract
To investigate the material dependence of the electronic structure of arsenide superconductors, the chemical trend of the Kohn–Sham band structures of a series of compounds, i.e., NaFeAs, NaCoAs, and NaNiAs, is studied by first-principles calculation based on generalized gradient approximation. Hypothetical structures of NaCoAs and NaNiAs in P4⁄nmm are found to be stable by structural optimization simulation. Results on the electronic states suggest that a characteristic two-dimensional electronic structure appearing as rodlike Fermi pockets is clearly found only in NaFeAs, while three-dimensional electronic structures are found in NaCoAs and NaNiAs with larger density of states than NaFeAs at the Fermi level, when paramagnetic electronic states are assumed.
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© The Physical Society of Japan 2009
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