Observation of higher-harmonic helical spin-resonance modes in the chromium spinel CdCr2O4.
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'.
Kimura
S
S
KYOKUGEN, Osaka University, Machikaneyama 1-3, Toyanaka 560-8531, Japan.
Hagiwara
M
M
Ueda
H
H
Narumi
Y
Y
Kindo
K
K
Yashiro
H
H
Kashiwagi
T
T
Takagi
H
H