Abstract
Electrical resistivity measurements have been performed on the system Mn 5− x ,Fe x Si 3 for the compounds x = 0,1,2,3,4 and 5 from 4.2 K to above room temperature. From the shape of the ρ( T) curves it can be inferred that the transition from antiferromagnetic to ferromagnetic ordering occurs in the concentration range 3 ⩽ x ⩽ 4; for Fe 5Si 3 and MnFe 4Si 3 the ρ( T) curves are characterized by a break in their slope, whereas for x = 1,2 and 3 a large minimum appears. Mn 5Si 3 exhibits two successive minima at 74 and 105 K. Magnetic susceptibility measurements for x = 1, 2 and 3 give confirmation of the Néel temperature for x = 1 and 2, whereas for x = 3 the behaviour is more complex.
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