caa a22 4500 445381566 CHVBK 20180317143019.0 cr unu---uuuuu 170323e20110101xx s 000 0 eng 10.1007/s10948-010-0923-5 doi (NATIONALLICENCE)springer-10.1007/s10948-010-0923-5 Fermi-surface Shrinking, Interband Coupling and Multiple Gaps in Iron-based Pnictides [Elektronische Daten] [E. Cappelluti, L. Ortenzi, L. Benfatto] 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≈0.46eV, which corresponds to a mass enhancement Z≈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, ...). Springer Science+Business Media, LLC, 2010 Pnictides nationallicence Multiband superconductivity nationallicence Band shifts nationallicence Spin-fluctuations nationallicence Cappelluti E. Institute of Complex Systems, CNR, U.O.S. Sapienza, v. dei Taurini 19, 00185, Rome, Italy aut Ortenzi L. Department of Physics, University "La Sapienza”, P.le A. Moro 2, 00185, Rome, Italy aut Benfatto L. Institute of Complex Systems, CNR, U.O.S. Sapienza, v. dei Taurini 19, 00185, Rome, Italy aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 229-233 1557-1939 24:1-2<229 2011 24 10948 https://doi.org/10.1007/s10948-010-0923-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-010-0923-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cappelluti E. Institute of Complex Systems, CNR, U.O.S. Sapienza, v. dei Taurini 19, 00185, Rome, Italy aut NATIONALLICENCE 700 1- Ortenzi L. Department of Physics, University "La Sapienza”, P.le A. Moro 2, 00185, Rome, Italy aut NATIONALLICENCE 700 1- Benfatto L. Institute of Complex Systems, CNR, U.O.S. Sapienza, v. dei Taurini 19, 00185, Rome, Italy aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/1-2(2011-01-01), 229-233 1557-1939 24:1-2<229 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer