Magnetic Properties of MnCo1-xFexGe (0 ≤ x ≤0.12)

Recently, it was found that ferromagnetic MnCo
_0.92
Fe
_0.08
Ge showed first-order transition between the paramagnetic and ferromagnetic state with a thermal hysteresis of 24 K, which was accompanied by the martensitic transformation from the hexagonal Ni
₂
In-type structure to the orthorhombic TiNiSi-type structure in the vicinity of 275K [1]. The compound showed both metamagnetic transition and magnetic field-induced martensitic transformation [1]. In this study, we performed magnetic and Mössbauer effect measurements of MnCo
_1-x
Fe
_x
Ge (0 ≤ x ≤ 0.12) to clarify its fundamental properties on magnetism.