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MM: Fachverband Metall- und Materialphysik

MM 52: Electronic Properties II

MM 52.6: Vortrag

Donnerstag, 25. März 2010, 12:45–13:00, H5

Fermi surface shrinking and interband coupling in iron-based pnictides — •Luciano Ortenzi¹, Emmanuele Cappelluti², Lara Benfatto^4,3,2, and Luciano Pietronero^3,2 — 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.