NpRhGe is the neptunium homologue of the ferromagnetic superconductor URhGe, and has been investigated using magnetization, electrical resistivity, specific heat and 237Np Mössbauer spectroscopy. NpRhGe exhibits antiferromagnetic ordering below TN21 K with an ordered magnetic moment µNp = 1.14 µB. The value of the isomer shift suggests a Np3+ charge state (configuration 5f4) and possible delocalization of the 5f electrons. The Brillouin-like (J = 1/2) thermal variation of the magnetic hyperfine field indicates that a doublet ground state of the neptunium ion may occur in this compound. The specific heat indicates a high Sommerfeld coefficient value for NpRhGe (195 mJ mol-1 K-2).
COLINEAU Eric;
SANCHEZ J.P.;
WASTIN Franck;
JAVORSKY P.;
HOMMA Y.;
REBIZANT Jean;
RIFFAUD E.;
BOULET P.;
2008-06-03
IOP PUBLISHING LTD
JRC45825
0953-8984,
https://publications.jrc.ec.europa.eu/repository/handle/JRC45825,
10.1088/0953-8984/20/25/255234,
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