title: Heavy quasiparticles in the ferromagnetic superconductor ZrZn2.
abstract: We report a study of the de Haas-van Alphen effect in the normal state of the ferromagnetic superconductor ZrZn2. Our results are generally consistent with a linear muffin-tin orbital band structure which predicts four exchange-split Fermi surface sheets. Quasiparticle effective masses are enhanced by a factor of 4.9 implying a strong coupling to magnetic excitations or phonons. ZrZn2 is unique among metallic ferromagnets in that it has a very large density of states in the ferromagnetic phase.
authors.affiliation: H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, United Kingdom.
authors.forename: S J C
authors.initials: SJ
authors.lastname: Yates
authors.forename: G
authors.initials: G
authors.lastname: Santi
authors.forename: S M
authors.initials: SM
authors.lastname: Hayden
authors.forename: P J
authors.initials: PJ
authors.lastname: Meeson
authors.forename: S B
authors.initials: SB
authors.lastname: Dugdale