Magnetic and Structural Properties of Metamagnetic MnCo0.92Fe0.08Ge Compound

Kosuke Ozono; Yoshifuru Mitsui; Masahiko Hiroi; Rie Y. Umetsu; Kohki Takahashi; Kazuyuki Matsubayashi; Yoshiya Uwatoko; Keiichi Koyama

doi:10.2320/matertrans.M2015382

This article has now been updated. Please use the final version.

Magnetic and Structural Properties of Metamagnetic MnCo_0.92Fe_0.08Ge Compound

Kosuke Ozono, Yoshifuru Mitsui, Masahiko Hiroi, Rie Y. Umetsu, Kohki Takahashi, Kazuyuki Matsubayashi, Yoshiya Uwatoko, Keiichi Koyama

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Keywords: MnCoGe, martensitic transformation, metamagnetic transition, powder X-ray diffraction, high magnetic field

JOURNAL FREE ACCESS Advance online publication

Article ID: M2015382

DOI https://doi.org/10.2320/matertrans.M2015382

The final version of this article is now available: Vol. 57 (2016), No. 3 pp. 316-320

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Abstract

The magnetic and structural properties of ferromagnetic MnCo_0.92Fe_0.08Ge were investigated by magnetization and X-ray powder diffraction measurements in magnetic fields up to 5 T. The compound showed first-order transition between the paramagnetic and ferromagnetic state with a thermal hysteresis of approximately 24 K, which was accompanied by the martensitic transformation from the hexagonal Ni₂In-type structure to the orthorhombic TiNiSi-type structure in the vicinity of 275 K. The cell volume expanded by 4.1% during the martensitic transformation. The magnetic moment of MnCo_0.92Fe_0.08Ge was estimated to be 111 Am² kg⁻¹ (3.7 μ_B/f.u.) at 10 K. The compound showed both metamagnetic transition and magnetic field-induced martensitic transformation.

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