Physics – Condensed Matter – Superconductivity
Scientific paper
2009-09-21
Phys. Rev. B 80, 214522 (2009)
Physics
Condensed Matter
Superconductivity
12 pages, 6 figures, final version
Scientific paper
10.1103/PhysRevB.80.214522
In this paper we provide a comprehesive analysis of different properties of pnictides both in the normal and superconducting state, with a particular focus on the optimally-doped Ba$_{1-x}$K$_{x}$Fe$_2$As$_2$ system. We show that, by using the band dispersions experimentally measured by ARPES, 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.
Benfatto Lara
Cappelluti Emmanuele
Castellani Claudio
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