A μ SR magnetic study of UNiGe

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作者：
Kalvius, G.M. [1 ]
Noakes, D.R. [2 ]
El-Khatib, S. [3 ]
Ansaldo, E.J. [4 ]
Stronach, C.E. [2 ]
Brück, E. [5 ]
Nakotte, H. [3 ]
机构：
[1] Physik Department, Technische Universität München, 85747 Garching, Germany
[2] Chemistry and Physics Department, Virginia State University, Petersburg, VA 23806, United States
[3] Physics Department, New Mexico State University, Las Cruces, NM 88003, United States
[4] University of Saskatchewan, Saskatoon, Sask. S7N OWO, Canada
[5] Van der Waals-Zeeman Instituut, Universiteit van Amsterdam, Valkenierstraat 65, 1018 XE Amsterdam, Netherlands
来源：
Journal of Alloys and Compounds | 2007年 / 441卷 / 1-2期
关键词：
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 &rarr 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 &rarr 0; implying the presence of some additional spin interactions which tries to suppress long-range magnetic order. © 2006 Elsevier B.V. All rights reserved;
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