Spin fluctuations in the stacked-triangular antiferromagnet YMnO3

Details Spin fluctuations in the stacked-triangular antiferromagnet YMnO3 Spin fluctuations in the stacked-triangular antiferromagnet YMnO3

2005-03-09

arxiv.org/abs/cond-mat/0503209v1

Physics

Condensed Matter

Strongly Correlated Electrons

JETP LETTERS, in press

Scientific paper

10.1134/1.1931017

The spectrum of spin fluctuations in the stacked-triangular antiferromagnet YMnO3 was studied above the Neel 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 Dq^z 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.

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