title: de Haas-van Alphen effect across the metamagnetic transition in Sr3Ru2O7.
abstract: We report a study of the de Haas-van Alphen (dHvA) effect on the itinerant metamagnet Sr3Ru2O7. Extremely high sample purity allows the observation of dHvA oscillations both above and below the metamagnetic transition field of 7.9 T. The quasiparticle masses are fairly large away from the transition, and are enhanced by up to an extra factor of 3 as the transition is approached, but the Fermi surface topography change is quite small. The results are qualitatively consistent with a field-induced Stoner transition in which the mass enhancement is the result of critical fluctuations.
authors.affiliation: School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom.
authors.forename: R A
authors.initials: RA
authors.lastname: Borzi
authors.forename: S A
authors.initials: SA
authors.lastname: Grigera
authors.forename: R S
authors.initials: RS
authors.lastname: Perry
authors.forename: N
authors.initials: N
authors.lastname: Kikugawa
authors.forename: K
authors.initials: K
authors.lastname: Kitagawa
authors.forename: Y
authors.initials: Y
authors.lastname: Maeno
authors.forename: A P
authors.initials: AP
authors.lastname: Mackenzie