Title: Ferromagnetic ordering in NpAl2: Magnetic susceptibility and 27Al nuclear magnetic resonance
Authors: MARTEL LAURAGRIVEAU Jean-ChristopheELOIRDI RachelSELFSLAG ChrisCOLINEAU EricCACIUFFO Roberto
Citation: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS vol. 387 p. 72 - 76
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2015
JRC N°: JRC94822
ISSN: 0304-8853
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC94822
DOI: 10.1016/j.jmmm.2015.03.089
Type: Articles in periodicals and books
Abstract: We report on the magnetic properties of the neptunium based ferromagnetic compound NpAl2. We used magnetization measurements and 27Al NMR spectroscopy to access magnetic features related in the paramagnetic and in the ordered state below TC (56 K). While very precise DC SQUID magnetization measurements confirm the FM state, they show as a reduced reverse field (HC~3000 Oe) and a small hysteresis loop at 5 K, well below the ordered state. The variable offset cumulative spectra (VOCS) acquired in the paramagnetic state shows a high sensitivity of the 27Al nuclei to the ferromagnetic ordering (Knight shifts and line broadening) even at room temperature. The oversimplified picture of NpAl2 as a well localised 5f system used as a reference compound for Mössbauer spectroscopy should be slightly reconsidered with some partly delocalised 5f states interacting at high temperature.
JRC Directorate:Nuclear Safety and Security

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