Magnetic and electronic properties of NpFeGa5

作者：Sanchez J P^*; Aoki D; Eloirdi R; Gaczynski P; Griveau J C; Colineau E; Caciuffo R

来源：Journal of Physics: Condensed Matter , 2011, 23(29): 295601.

DOI：10.1088/0953-8984/23/29/295601

NpFeGa5 single crystals prepared by the Ga-flux method have been investigated by magnetisation, specific heat and Np-237 Mossbauer spectroscopy measurements. An antiferromagnetic (AF) transition has been observed at T-N similar to 114 K. The second AF transition which takes place at T* similar to 74 K has only been detected in the magnetisation data. A saturated ordered Np moment of 1.00(5) mu(B) and the occurrence of an Np3+ charge state were inferred from the Mossbauer data. The angle between the Np ordered moment and the basal plane was shown to be similar to 17 degrees, 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 Mossbauer spectroscopy indicated a partial spatial delocalisation of the 5f electrons in NpFeGa5.

• 出版日期2011-7-27
• 单位中国地震局