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 Ba0.6K0.4Fe2As2, 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,......).

Fermi-surface Shrinking, Interband Coupling and Multiple Gaps in Iron-based Pnictides / Cappelluti, E.; Ortenzi, L.; Benfatto, L.. - In: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM. - ISSN 1557-1939. - 24:1-2(2011), pp. 229-233. [10.1007/s10948-010-0923-5]

Fermi-surface Shrinking, Interband Coupling and Multiple Gaps in Iron-based Pnictides

Cappelluti E.;Benfatto L.
2011

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 Ba0.6K0.4Fe2As2, 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,......).
2011
ELECTRONIC-STRUCTURE; SUPERCONDUCTOR
01 Pubblicazione su rivista::01a Articolo in rivista
Fermi-surface Shrinking, Interband Coupling and Multiple Gaps in Iron-based Pnictides / Cappelluti, E.; Ortenzi, L.; Benfatto, L.. - In: JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM. - ISSN 1557-1939. - 24:1-2(2011), pp. 229-233. [10.1007/s10948-010-0923-5]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1336277
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