Magnetic Anisotropy in NpRhGa5 Single Crystals
We have investigated oriented single crystals of the antiferromagnet NpRhGa5 (TN37 K) by means of magnetization and specific heat measurements. Strong anisotropy effects are observed: when magnetic fields are applied in the basal plane, the Néel temperature is barely affected. In contrast, in fields applied along the c axis, the second-order transition (magnetic ordering) is shifted to lower temperatures and merges into the first-order transition (reorientation of the magnetic moments). A full mapping of this complex magnetic phase diagram as a function of the temperature (down to 1.6 K), applied magnetic field (up to 9 T) and crystal orientation is presented. This study shows that antiferromagnetic order is more fragile when the magnetic field is applied along the c axis, which is similar to the situation observed for the NpCoGa5 homologue compound.
COLINEAU Eric;
WASTIN Franck;
REBIZANT Jean;
2005-12-22
IOP PUBLISHING LTD
JRC31770
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