The structural transformation of a ferromagnetic Mn 1.07 Co 0.92 Ge compound was studied by magnetization measurement in magnetic fields up to 13 T and powder X-ray diffraction measurement in fields up to 5 T. The Curie temperature is determined to be 275 K. At room temperature, the compound has a hexagonal Ni 2 In-type structure, and it transforms diffusionlessly into an orthorhombic TiNiSi-type structure at M S =210 K with hysteresis. The cell volume expands by 5.3% and the magnetic moment increases by 24% at M S , accompanied with this martensitic structural transformation. In addition, we confirmed for the first time that magnetic field induces the structural transformation in Mn 1.07 Co 0.92 Ge at the vicinity of M S .
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Koyama et al. (2004) studied this question.
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