Abstract
The unusual zero-magnetization ferromagnet $({\mathrm{Sm}}_{1\ensuremath{-}x}{\mathrm{Gd}}_{x}){\mathrm{Al}}_{2}$ (SGA) with $x=0.01$ and 0.02 is investigated by magnetic, and magnetotransport and calorimetric measurements. Striking features observed around the compensation temperature ${T}_{\mathrm{comp}}$ are an exchange bias in a single-magnetic-lattice compound such as SGA attributable to the anisotropy of the coupling between the spin and orbital moments; an anomalous Hall effect due to the asymmetric magnetic scattering of the conduction electrons; and a field-induced specific heat transition at ${T}_{\mathrm{comp}}$ ascribable to the field-induced switching of the spin and orbital moments in a polarized conduction electron sea. The observations reveal the richness of physics in the SGA compound system.
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