Functional renormalization group study of an eight-band model for the iron arsenides

J. Lichtenstein, S. A. Maier, C. Honerkamp, C. Platt, R. Thomale, O. K. Andersen, and L. Boeri

Phys. Rev. B 89, 214514 – Published 26 June 2014

Abstract

We investigate the superconducting pairing instabilities of eight-band models for the iron arsenides. Using a functional renormalization group treatment, we determine how the critical energy scale for superconductivity depends on the electronic band structure. Most importantly, if we vary the parameters from values corresponding to LaFeAsO to SmFeAsO, the pairing scale is strongly enhanced, in accordance with the experimental observation. We analyze the reasons for this trend and compare the results of the eight-band approach to those found using five-band models.

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Received 31 March 2014
Revised 29 May 2014

DOI:https://doi.org/10.1103/PhysRevB.89.214514

Authors & Affiliations

J. Lichtenstein¹, S. A. Maier¹, C. Honerkamp¹, C. Platt², R. Thomale², O. K. Andersen³, and L. Boeri^3,4

¹Institute for Theoretical Solid State Physics, RWTH Aachen University, D-52056 Aachen, Germany and JARA - FIT Fundamentals of Future Information Technology
²Institute for Theoretical Physics and Astrophysics, University of Würzburg, D-97074 Würzburg, Germany
³Max-Planck-Institute for Solid State Research, Stuttgart, D-70569 Stuttgart, Germany
⁴Institute for Theoretical Physics, Graz University of Technology, 8010 Graz, Austria

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Vol. 89, Iss. 21 — 1 June 2014

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