- Conference date: 3-6 December 1974
- Location: San Francisco, CA, USA
Critical fluctuations above the Curie point in nickel have been studied by observing th relaxation of the free precession of positive muons. This work was prompted by the apparent discrepancy in nickel spin correlation time as determined by neutron scattering and by perturbed angular correlation (PAC) experiments. Up to 20K above the Curie point we obtain a temperature dependence in agreement with that determined from PAC. At higher temperatures the computed nickel spin correlation time becomes independent of temperature. The observed high temperature muon relaxation time of 16 μsec is very much shorter than expected from either the observed contact field at the low temperature muon site or from classical dipolar coupling to the muon nearest neighbors. The increased relaxation rate may arise from an enhanced pseudodipolar interaction.
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