The unusual zero-magnetization ferromagnet ͑Sm 1−x Gd x ͒Al 2 ͑SGA͒ with x = 0.01 and 0.02 is investigated by magnetic, and magnetotransport and calorimetric measurements. Striking features observed around the compensation temperature T 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 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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