title: Anomalous de Haas-van Alphen oscillations in CeCoIn5.
abstract: We present de Haas-van Alphen oscillation measurements showing a strong spin dependence of the quasiparticle mass enhancement in the heavy fermion superconductor CeCoIn5 at high magnetic fields. There is evidence that the Fermi-liquid temperature dependence of the oscillations, embodied in the Lifshitz-Kosevich equation, is breaking down on the most strongly renormalized Fermi surface sheets.
authors.affiliation: Cavendish Laboratory, Madingley Road, Cambridge CB3 OHE, United Kingdom.
authors.forename: A
authors.initials: A
authors.lastname: McCollam
authors.forename: S R
authors.initials: SR
authors.lastname: Julian
authors.forename: P M C
authors.initials: PM
authors.lastname: Rourke
authors.forename: D
authors.initials: D
authors.lastname: Aoki
authors.forename: J
authors.initials: J
authors.lastname: Flouquet