A μ SR magnetic study of UNiGe

G. M. Kalvius, D. R. Noakes, S. El-Khatib, E. J. Ansaldo, C. E. Stronach, E. Brück, H. Nakotte

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Abstract

We have carried out μ SR spectroscopy on polycrystalline UNiGe between 2 K and 100 K. The existence of two magnetic transitions at TN = 51 K and T1 = 41.5 K is confirmed. The μ SR spectra clearly reveal that the magnetic state between 51 K and 41.5 K is an incommensurate spin structure ruling out a spin-slip structure which had been considered an alternative. Below 41.5 K the spectra are compatible with simple antiferromagnetic order. The local field for T → 0 is Bμ = 170 mT, a comparatively low value, indicating a rather small uranium ordered moment. When going from the commensurate to the incommensurate structures at T1 a sudden reduction in local field by 23% occurs reflecting an equal change in ordered moment. The transition at T1 is sharp, but TN extends over roughly 5 K. The antiferromagnetic spin structure exhibits persistent spin fluctuations in the limit T → 0, implying the presence of some additional spin interactions which tries to suppress long-range magnetic order.

Original languageEnglish (US)
Pages (from-to)11-18
Number of pages8
JournalJournal of Alloys and Compounds
Volume441
Issue number1-2
DOIs
StatePublished - Aug 30 2007

Keywords

  • Antiferromagnetism
  • Muon spin rotation
  • Uranium intermetallics

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