title: Field-induced paramagnons at the metamagnetic transition of Ca1.8Sr0.2RuO4.
abstract: The magnetic excitations in Ca1.8Sr0.2RuO4 were studied across the metamagnetic transition and as a function of temperature using inelastic neutron scattering. At low temperature and low magnetic field the magnetic response is dominated by a complex superposition of incommensurate antiferromagnetic fluctuations. Upon increasing the magnetic field across the metamagnetic transition, paramagnon and finally well-defined magnon scattering is induced, partially suppressing the incommensurate signals. The high-field phase in Ca1.8Sr0.2RuO4, therefore, has to be considered as an intrinsically ferromagnetic state stabilized by the magnetic field.
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, D-50937 Köln, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Steffens
authors.forename: Y
authors.initials: Y
authors.lastname: Sidis
authors.forename: P
authors.initials: P
authors.lastname: Link
authors.forename: K
authors.initials: K
authors.lastname: Schmalzl
authors.forename: S
authors.initials: S
authors.lastname: Nakatsuji
authors.forename: Y
authors.initials: Y
authors.lastname: Maeno
authors.forename: M
authors.initials: M
authors.lastname: Braden