Magnetocaloric effect and magnetostructural coupling in Mn0.92Fe0.08CoGe compound Academic Article uri icon

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 −ΔSMmax can be expressed as −ΔSMmax ∝ 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.

authors

  • Wang, J. L.
  • Shamba, P.
  • Hutchison, W. D.
  • Gu, Q. F.
  • Md Din, Muhamad Faiz
  • Ren, Q. Y.
  • Cheng, Z. X.
  • Kennedy, S. J.
  • Campbell, S. J.
  • Dou, S. X.

publication date

  • 2015

volume

  • 117

issue

  • 17