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The magnetism and transport properties of Hf 1− x Ta x Fe 2 (0.1≤ x ≤0.2) and Mn 2− x Cr x Sb ( x =0.1) were studied. Hf 1− x Ta x Fe 2 ( x >0.15) has a successive magnetic transition from ferromagnetism to paramagnetism via antiferromagnetism at temperatures between 150 and 350 K, and the transition has a considerable effect on the transport property. In particular, a specimen with x =0.155 shows a metamagnetic transition near room temperature, and a significant magnetoresistance as large as 12% is observed in accordance with the metamagnetic transition. Mn 1.9 Cr 0.1 Sb, which has a first-order magnetic transition from antiferromagnetism to ferrimagnetism at about 300 K, also shows a field-induced magnetic transition at 300 K, and the transition strongly affects the transport property. A giant magnetoresistance as large as 30% was observed at about 300 K under an applied field of 20 kOe. The metamagnetic transition seems to give rise to giant magnetoresistance via s–d scattering. |
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