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Spectroscopic and thermodynamic properties in a four-band model for pnictides

L. Benfatto, E. Cappelluti, and C. Castellani
Phys. Rev. B 80, 214522 – Published 18 December 2009

Abstract

In this paper we provide a comprehensive analysis of different properties of pnictides both in the normal and superconducting state, with a particular focus on the optimally doped Ba1xKxFe2As2 system. We show that, by using the band dispersions experimentally measured by angle-resolved photoemission spectroscopy, a four-band Eliashberg model in the intermediate-coupling regime can account for both the measured hierarchy of the gaps and for several spectroscopic and thermodynamic signatures of low-energy renormalization. These include the kinks in the band dispersion and the effective masses determined via specific-heat and superfluid-density measurements. We also show that, although an intermediate-coupling Eliashberg approach is needed to account for the magnitude of the gaps, the temperature behavior of the thermodynamic quantities does not show in this regime a significant deviation with respect to weak-coupling BCS calculations. This can explain the apparent success of two-band BCS fits of experimental data reported often in the literature.

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  • Received 23 September 2009

DOI:https://doi.org/10.1103/PhysRevB.80.214522

©2009 American Physical Society

Authors & Affiliations

L. Benfatto1,2,3, E. Cappelluti2,3, and C. Castellani3,2

  • 1Centro Studi e Ricerche “Enrico Fermi,” via Panisperna 89/A, 00184 Rome, Italy
  • 2SMC Research Center, CNR-INFM, and ISC-CNR, via dei Taurini 19, 00185 Rome, Italy
  • 3Dipartimento di Fisica, Università “La Sapienza,” Piazzale Aldo Moro 2, 00185 Rome, Italy

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Issue

Vol. 80, Iss. 21 — 1 December 2009

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