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Spin fluctuations in the stacked-triangular antiferromagnet YMnO3

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arxiv cond-mat/0503209 v1 pith:SWVE5SR5 submitted 2005-03-09 cond-mat.str-el

B. Roessli , S.N. Gvasaliya , E. Pomjakushina , K. Conder This is my paper · ORCID
classification cond-mat.str-el
keywords fluctuationsaboveantiferromagnetin-planeout-of-planespinstacked-triangularymno3
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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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