title: Observation of higher-harmonic helical spin-resonance modes in the chromium spinel CdCr2O4.
abstract: High frequency ESR measurements on the chromium spinel compound CdCr2O4 have been performed. The observed ESR modes below Hc' approximately 5.7 T can be explained well by the calculated resonance modes based on a molecular field theory assuming a helical spin structure. Other than the fundamental ones, we have succeeded in observing the higher-harmonic modes for the first time. A large change of the ESR modes above Hc' indicate that a variation of the spin structure from the helical to the four-sublattice canted one takes place around Hc'.
authors.affiliation: KYOKUGEN, Osaka University, Machikaneyama 1-3, Toyanaka 560-8531, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kimura
authors.forename: M
authors.initials: M
authors.lastname: Hagiwara
authors.forename: H
authors.initials: H
authors.lastname: Ueda
authors.forename: Y
authors.initials: Y
authors.lastname: Narumi
authors.forename: K
authors.initials: K
authors.lastname: Kindo
authors.forename: H
authors.initials: H
authors.lastname: Yashiro
authors.forename: T
authors.initials: T
authors.lastname: Kashiwagi
authors.forename: H
authors.initials: H
authors.lastname: Takagi