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Fermi-surface shrinking, interband coupling and multiple gaps in iron-based pnictides (Articolo in rivista)

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Fermi-surface shrinking, interband coupling and multiple gaps in iron-based pnictides (Articolo in rivista) (literal)

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E. Cappelluti (1,2); L. Ortenzi (2); L. Benfatto (1,2) (2011)
Fermi-surface shrinking, interband coupling and multiple gaps in iron-based pnictides
in Journal of superconductivity and novel magnetism; Springer Science+Business Media, Berlin, Heidelberg (Germania)
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1 Institute of Complex Systems, CNR, U.O.S. Sapienza, v. dei Taurini 19, 00185 Rome, Italy 2 Department of Physics, University \"La Sapienza\", P.le A. Moro 2, 00185 Rome, Italy 3 Max-Planck-Institut für Festkörperforschung, Stuttgart, Germany (literal)

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Fermi-surface shrinking, interband coupling and multiple gaps in iron-based pnictides (literal)

Abstract

In this contribution we present a comprehensive explanation for the origin of the band shifts observed in dHvA and ARPES experiments. Using a four-band Eliashberg analysis, we show that they are a natural consequence of the multiband character of these systems and of the strong particle-hole asymmetry of the bands. We also show that the relative sign of such shifts provides a direct experimental evidence of a dominant interband scattering. A quantitative analysis in LaFePO yields a spin-mediated interband coupling of the order V approximate to 0.46 eV, which corresponds to a mass enhancement Z approximate to 1.4. We also employ such four-band model to investigate the magnitude of the superconducting gap on different Fermi sheets of Ba(0.6)K(0.4)Fe(2)As(2), and we show that the same four-band model provides a simple explanation of the different gap values on different Fermi sheets and of the thermodynamics properties (specific heat, superfluid density,......). (literal)

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