A SR magnetic study of UNiGe

We have carried out SR spectroscopy on polycrystalline UNiGe between 2K and 100K. The existence of two magnetic transitions at TN=51 K and T1=41.5 K is confirmed. The SR spectra clearly reveal that the magnetic state between 51K and 41.5K is an incommensurate spin structure ruling out a spin-slip st...

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Bibliographic Details
Published in:Journal of alloys and compounds 2007-08, Vol.441 (1-2), p.11-18
Main Authors: Kalvius, G.M., Noakes, D.R., El-Khatib, S., Ansaldo, E.J., Stronach, C.E., Brück, E., Nakotte, H.
Format: Article
Language:English
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Summary:We have carried out SR spectroscopy on polycrystalline UNiGe between 2K and 100K. The existence of two magnetic transitions at TN=51 K and T1=41.5 K is confirmed. The SR spectra clearly reveal that the magnetic state between 51K and 41.5K is an incommensurate spin structure ruling out a spin-slip structure which had been considered an alternative. Below 41.5K the spectra are compatible with simple antiferromagnetic order. The local field for T- > 0 is Bmu=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 5K. 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.
ISSN:0925-8388
DOI:10.1016/j.jallcom.2006.09.119