Abstract
The magneto-transport properties are investigated in metamagnetic CoMnSi0.88Ge0.12 alloy. By applying a magnetic field or increasing temperature, a metamagnetic phase transition from antiferromagnetic to ferromagnetic is observed in this alloy. Around the metamagnetic phase transition, CoMnSi0.88Ge0.12 alloy exhibits a large and negative magnetoresistance effect (∼32%) under a magnetic field of 20 kOe (1 Oe = 79.5775 A/m), which is ascribed to the spin-dependent scattering of conduction electrons.
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