Regensburg 2010 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 52: Electronic Properties II
MM 52.6: Talk
Thursday, March 25, 2010, 12:45–13:00, H5
Fermi surface shrinking and interband coupling in iron-based pnictides — •Luciano Ortenzi1, Emmanuele Cappelluti2, Lara Benfatto4,3,2, and Luciano Pietronero3,2 — 1Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany — 2SMC Research Center, CNR-INFM, c/o ISC-CNR, via dei Taurini 19, 00185 Rome, Italy — 3Dipart. di Fisica, Università “La Sapienza”, P.le A. Moro 2, 00185 Rome, Italy — 4Centro Studi e Ricerche “Enrico Fermi”, v. Panisperna 89/A, 00184, Rome, Italy
Measurements of Fermi surface with de Haas-van Alphen oscillations in LaFePO showed a shrinking of the Fermi pockets with respect to first-principle LDA calculations, suggesting an energy shift of the hole and electrons bands with respect to LDA. In this talk I will show that these shifts are a natural consequence of the strong particle-hole asymmetry of electronic bands in pnictides, and that they provide an indirect experimental evidence of a dominant interband scattering in these systems. Recent measurement in 122 systems confirm this picture.