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Advances in Condensed Matter Physics
Volume 2010 (2010), Article ID 167985, 6 pages
http://dx.doi.org/10.1155/2010/167985
Research Article

The Phenomenology of Iron Pnictides Superconductors Explained in the Framework of 𝑠 -Wave Three-Band Eliashberg Theory

Dipartimento di Fisica and CNISM, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy

Received 25 May 2009; Revised 10 August 2009; Accepted 3 September 2009

Academic Editor: Igor Mazin

Copyright © 2010 G. A. Ummarino. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The s-wave three-band Eliashberg theory can simultaneously reproduce the experimental critical temperatures and the gap values of the superconducting materials L a F e A s O 0 . 9 F 0 . 1 , B a 0 . 6 K 0 . 4 F e 2 A s 2 and S m F e A s O 0 . 8 F 0 . 2 as exponent of the more important families of iron pnictides. In this model the dominant role is played by interband interactions and the order parameter undergoes a sign reversal between hole and electron bands ( 𝑠 ± -wave symmetry). The values of all the gaps (with the exact experimental critical temperature) can be obtained by using high values of the electron-boson coupling constants and small typical boson energies (in agreement with experiments).