Abstract
DC magnetisation, electrical resistivity, specific heat and 155Gd Mössbauer spectroscopy measurements demonstrate that the Gd sub-lattice of GdNiAl 4 undergoes two magnetic transitions ( T N = 24.7 K , T N ′ = 20.8 K ) as the temperature is decreased. Given that Gd 3+ is an S-state ion, a crystal field mechanism can be ruled out as the origin of similar behaviour observed elsewhere for RNiAl 4 with R=Pr 1− x Nd x ( 0 ⩽ x ⩽ 0.7 ) and Tb. Based on a comparison of point charge model calculations of the electric field gradient tensor with those measured at the 155Gd nucleus, it is deduced that the magnetisation is aligned with either the b- or c-crystallographic axis of the orthorhombic structure.
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