Pressure tuning of the magnetic transition in Gd5(Si0.375Ge0.625)4 giant magnetocaloric effect material

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The effect of hydrostatic pressure on the ferromagnetic ordering transition of the monoclinic Gd5(Si0.375Ge0.625)4 giant magnetocaloric effect compound was investigated using x-ray magnetic circular dichroism measurements in a diamond anvil cell. The Curie temperature TC increases linearly with applied pressure up to ∼7.2GPa, at which point a discontinuity in dTC∕dP occurs. This discontinuity, which appears when TC reaches ∼277K, is also observed when the unit cell volume is reduced by Si doping and is associated with the volume-driven monoclinic (M) to orthorhombic [O(I)] structural transition.