Magnetic and electronic properties of NpFeGa5

J. P. Sanchez, D. Aoki, R. Eloirdi, P. Gaczyński, J. C. Griveau, E. Colineau, R. Caciuffo

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4 Citations (Scopus)


NpFeGa5 single crystals prepared by the Ga-flux method have been investigated by magnetisation, specific heat and 237Np Mössbauer spectroscopy measurements. An antiferromagnetic (AF) transition has been observed at TN ∼ 114K. The second AF transition which takes place at T* ∼ 74K has only been detected in the magnetisation data. A saturated ordered Np moment of 1.00(5) μB and the occurrence of an 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 us 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 delocalisation of the 5f electrons in NpFeGa5.

Original languageEnglish
Article number295601
JournalJournal of Physics Condensed Matter
Issue number29
Publication statusPublished - 2011 Jul 27


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