Abstract
Neutron polarisation analysis measurements reveal antiferromagnetic spin correlations persisting to temperatures of 120 K in Pauli paramagnetic Y(Mn1−xFe x )2, 0.03≤x≤0.05. The mean moment at the Mn(Fe) site is found to be 0.2μB. Transverse field μSR is characterised by weak exponential damping with a rate of 0.02 μs−1 at 300 K increasing according to the power lawT−0.75 to only 0.16μ S −1 at 12 K. It is suggested that these results are consistent with a slowing down of longitudinal spin fluctuations at the Mn site as temperature decreases.
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