Effective five band analysis on T sub(c) vs. lattice structure correlation in iron pnictides

In the present study, we investigate the effect of the lattice structure in the iron pnictides within the spin fluctuation pairing theory based on the effective five band models of several hypothetical lattice structures of LaFeAsO. We show that the presence and absence of Fermi surface pockets is s...

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Bibliographic Details
Published in:Journal of physics. Conference series 2012-01, Vol.400, p.1-4
Main Authors: Usui, Hidetomo, Kuroki, Kazuhiko
Format: Article
Language:English
Subjects:
Band theory
Bonding
Fermi surfaces
Guidelines
Iron
Lattices
Pocket
Superconductivity
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Summary:In the present study, we investigate the effect of the lattice structure in the iron pnictides within the spin fluctuation pairing theory based on the effective five band models of several hypothetical lattice structures of LaFeAsO. We show that the presence and absence of Fermi surface pockets is sensitive to the Fe-As-Fe bond angle due to the multiorbital nature of the system, which is reflected to the nodeless/nodal form of the superconducting gap and T sub(c). Superconductivity is maximized within the maximum hole Fermi surface multiplicity regime where the arsenic atoms form a regular tetrahedron. Superconductivity has an overall tendency of increasing upon increasing Fe-As bond length. We provide a guideline of higher T sub(c) from the lattice structure point of view.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/400/2/022129