title: de Haas-van Alphen effect in ZrZn2 under pressure: crossover between two magnetic states.
abstract: We report measurements of the de Haas-van Alphen effect in ZrZn2 under hydrostatic pressures up to 21 kbar where the Curie temperature vanishes. The exchange splitting of a Fermi surface changes in behavior with increasing magnetic field, which is qualitatively consistent with the behavior of the high-field magnetization, suggesting the existence of a crossover between two distinct magnetic states. These and previously unexplained findings may be understood in terms of a p-T-B phase diagram qualitatively similar to that of the ferromagnetic superconductor UGe2.
authors.affiliation: Center for Low Temperature Science, Tohoku University, Sendai, Miyagi 980-8578, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Kimura
authors.forename: M
authors.initials: M
authors.lastname: Endo
authors.forename: T
authors.initials: T
authors.lastname: Isshiki
authors.forename: S
authors.initials: S
authors.lastname: Minagawa
authors.forename: A
authors.initials: A
authors.lastname: Ochiai
authors.forename: H
authors.initials: H
authors.lastname: Aoki
authors.forename: T
authors.initials: T
authors.lastname: Terashima
authors.forename: S
authors.initials: S
authors.lastname: Uji
authors.forename: T
authors.initials: T
authors.lastname: Matsumoto
authors.forename: G G
authors.initials: GG
authors.lastname: Lonzarich