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We report the observation of giant negative magnetoresistance up to −46% at 60kOe magnetic field in Ni 1.68 Co 0.32 Mn 1.20 Ga 0.80 alloy, which is about 5 times larger than that reported in Ni–Mn–Ga alloys. The significant change in resistivity during martensitic transformation originates from the altered electronic structure due to the change of magnetic state. The...
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