First direct evidence for a magnetic phase transition in the heavy-electron system UCd11
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Muon-spin-rotation and relaxation measurements performed on polycrystalline UCd11 give first direct evidence for an antiferromagnetic phase transition at 5 K. As far as probed by the positive muon the behaviour close to the phase transition is clearly contrasted to that in other magnetic heavy-electron materials investigated by μ+SR, e.g. U2Zn17 and UCu5, because in UCd11 longitudinal field measurements reveal dynamic relaxation effects which are attributed to the critical slowing down of the uranium 5f-moments. No signal could be observed in the ordered regime because of a large dipolar field spread.
KeywordsThin Film Phase Transition Uranium Direct Evidence Field Measurement
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