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14. Magnetocaloric effect and magnetostructural coupling in Mn0.92Fe0.08CoGe compound

Author

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., and Dou, S.X.

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 -ΔSM max can be expressed as -ΔSM 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 Ni2In-type structure (space group P63/mmc). Application of external pressure drives a structure change from the orthorhombic TiNiSi-type structure to the hexagonal Ni2In-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.

Published
2015

15. Driving Magnetostructural Transitions in Layered Intermetallic Compounds

Author

Wang, J.L. (author), Caron, L. (author), Campbell, S.J. (author), Kennedy, S.J. (author), Hofmann, M. (author), Cheng, Z.X. (author), Md Din, M.F. (author), Studer, A.J. (author), Brück, E. (author), Dou, S.X. (author), Wang, J.L. (author), Caron, L. (author), Campbell, S.J. (author), Kennedy, S.J. (author), Hofmann, M. (author), Cheng, Z.X. (author), Md Din, M.F. (author), Studer, A.J. (author), Brück, E. (author), and Dou, S.X. (author)

Abstract

We report the dramatic effect of applied pressure and magnetic field on the layered intermetallic compound Pr0.5Y0.5Mn2Ge2. In the absence of pressure or magnetic field this compound displays interplanar ferromagnetism at room temperature and undergoes an isostructural first order magnetic transition (FOMT) to an antiferromagnetic state below 158 K, followed by another FOMT at 50 K due to the reemergence of ferromagnetism as praseodymium orders (TCPr). The application of a magnetic field drives these two transitions towards each other, whereas the application of pressure drives them apart. Pressure also produces a giant magnetocaloric effect such that a threefold increase of the entropy change associated with the lower FOMT (at TCPr) is seen under a pressure of 7.5 kbar. First principles calculations, using density functional theory, show that this remarkable magnetic behavior derives from the strong magnetoelastic coupling of the manganese layers in this compound., RST/Radiation, Science and Technology, Applied Sciences

Published
2013
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