Abstract
The effect of hydrostatic pressure on the magnetic properties has been investigated for itinerant-electron metamagnetic Hf1−xTaxFe2 (x=0.125 and 0.14) compounds which exhibit a temperature-induced transition from the ferromagnetic (FM) to the antiferromagnetic (AFM) state upon heating. Both the magnetic transition temperature TFM–AFM and the spontaneous magnetization MS decreases with increasing pressure. The application of an external pressure leads also to the strong increase of the AFM–FM transition field μ0Hcr. The magnitude of the pressure coefficient, dln(TFM–AFM)/dP, is much larger than that of dln(MS)/dP. This extremely large difference between the pressure coefficients is explained by the influence of spin fluctuations on the magnetovolume effects in the compounds Hf0.875Ta0.125Fe2 and Hf0.86Ta0.14Fe2.
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