Abstract
Magnetization measurements have been done from 77 K to 600 K on MnCo x Sb [0.1 ≤ x ≤ 0.25]. For all the concentrations other than x =0.25, the temperature variation of magnetization was found to follow the Stoner model. Anomalous behaviour observed in the case of MnCo 0.25 Sb is attributed to the exchange interaction between Mn–Co dominating over that of the exchange interaction between Mn–Mn. Electrical resistivity studies carried out in the temperature range 85–300 K show metallic behaviour for all samples excepting in the case of MnCo 0.25 Sb where an anomalous behaviour has been observed. This has been attributed to the scattering of conduction electrons due to the fluctuation of magnetic moment of Co atoms dominating over that due to the regular site magnetic moment of Mn atom.
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