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VOLUME 81 (2005) | ISSUE 6 | PAGE 351
Spin fluctuations in the stacked-triangular antiferromagnet YMnO3
PACS: 75.40.-s, 78.70.Nx
Abstract
The spectrum of spin fluctuations in the stacked-triangular antiferromagnet YMnO3 was studied above the Néel temperature using both unpolarized and polarized inelastic neutron scattering. We find an in-plane and an out-of-plane excitation. The in-plane mode has two components just above TN, a resolution-limited central peak and a Debye-like contribution. The quasi-elastic fluctuations have a line-width that increases with q like Dqz and the dynamical exponent z=2.3. The out-of-plane fluctuations have a gap at the magnetic zone center and do not show any appreciable q-dependence at small wave-vectors.