Abstract
Cluster perturbation theory is used to calculate band structure, spectral functions, Fermi surface, and spin and charge susceptibilities for the two-orbital model of iron pnictides with the on-site multiorbital Hubbard interactions. Susceptibilities are calculated within the approximation combining the cluster perturbation theory for the self-energy corrections and the random-phase approximation (RPA) for the vertex renormalizations. Calculations for the small values of Hubbard repulsion U ≤ 2 eV confirm that the rigid band approximation and RPA for the spin and charge susceptibilities are suitable approaches for the case of weak interactions.
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We acknowledge partial support by RFBR (grants 12-02-31534, 13-02-01395, and 16-02-00098), and Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2).
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Nikolaev, S.V., Korshunov, M.M. Spin and Charge Susceptibilities of the Two-Orbital Model within the Cluster Perturbation Theory for Fe-Based Materials. J Supercond Nov Magn 29, 3093–3097 (2016). https://doi.org/10.1007/s10948-016-3784-8
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DOI: https://doi.org/10.1007/s10948-016-3784-8