Abstract
NpFeGa5 single crystals prepared by the Ga-flux method have been investigated by magnetisation, specific heatand 237Np Mössbauer spectroscopy measurements. An antiferromagnetic (AF) transition has been observed atTN ∼ 114 K. The second AF transition which takes place atT* ∼ 74 K has only been detected in the magnetisation data. A saturated ordered Np moment of 1.00(5)μB and theoccurrence of an Np3 + charge state were inferred from the Mössbauer data. The angle betweenthe 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 temperatureAF phase. The absence of change of the quadrupole interaction parameters atT* did not allow us to gain information on the Np moment reorientation atT*. The trend of theisomer shift along the NpTGa5 series and the discrepancy between the Np moments determined by neutron diffraction andMössbauer spectroscopy indicated a partial spatial delocalisation of the 5f electrons inNpFeGa5.
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