Title: Magnetic and Electronic Properties of NpFeGa5
Authors: SANCHEZ J.p.AOKI DaiELOIRDI RachelGACZYNSKI PiotrGRIVEAU Jean-ChristopheCOLINEAU EricCACIUFFO Roberto
Citation: JOURNAL OF PHYSICS-CONDENSED MATTER vol. 23 no. 29 p. 295601 (6pp)
Publisher: IOP PUBLISHING LTD
Publication Year: 2011
JRC N°: JRC64648
ISSN: 0953-8984
URI: http://iopscience.iop.org/0953-8984/23/29/295601/
http://publications.jrc.ec.europa.eu/repository/handle/JRC64648
DOI: 10.1088/0953-8984/23/29/295601
Type: Articles in Journals
Abstract: NpFeGa5 single crystals prepared by the Ga-flux method have been investigated by magnetization, specific heat and 237Np Mössbauer spectroscopy measurements. An antiferromagnetic (AF) transition has been observed at TN ~ 114 K. The second AF transition which takes place at T* ~ 74 K has only been detected in the magnetization data. A saturated ordered Np moment of 1.00(5)µB and the occurrence of a Np3+ charge state were inferred from the Mössbauer data. The angle between the Np ordered moment and the basal plane was shown to be ~ 17°, in good agreement with the value observed by neutron diffraction in the low temperature AF phase. The absence of change of the quadrupole interaction parameters at T* did not allow to gain information on the Np moment reorientation at T*. The trend of the isomer shift along the NpTGa5 series and the discrepancy between the Np moments determined by neutron diffraction and Mössbauer spectroscopy indicated a partial spatial delocalization of the 5f-electrons in NpFeGa5.
JRC Institute:Institute for Transuranium Elements

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