RIS ID

97911

Publication Details

Wang, J. L., Shamba, P., Hutchison, W. D., Gu, Q. F., Md Din, M. F., Ren, Q. Y., Cheng, Z. X., Kennedy, S. J., Campbell, S. J. & Dou, S. X. (2015). Magnetocaloric effect and magnetostructural coupling in Mn0.92Fe0.08CoGe compound. Journal of Applied Physics, 117 (17), 17D103-1-17D103-4.

Abstract

The structural properties of Mn0.92Fe0.08CoGe have been investigated in detail using synchrotron x-ray diffraction in zero and applied pressure (p = 0-10 GPa). A ferromagnetic transition occurs around TC = 300 K and a large magnetic-entropy change −ΔSM = 17.3 J/kg K detected at TC for a field change of ΔB = 5 T. The field dependence of −ΔS M max can be expressed as −ΔS M max ∝ B. At ambient temperature and pressure, Mn0.92Fe0.08CoGe exhibits a co-existence of the orthorhombic TiNiSi-type structure (space group Pnma) and hexagonal Ni 2In-type structure (space group P63/mmc). Application of external pressure drives a structure change from the orthorhombic TiNiSi-type structure to the hexagonal Ni 2In-type structure. A large anomaly in heat capacity around TC is detected and the Debye temperature θD (=319(±10) K) has been derived from analyses of the low temperature heat capacity, T ≲ 10 K.

Grant Number

ARC/DP110102386

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Link to publisher version (DOI)

http://dx.doi.org/10.1063/1.4906437