Abstract
Among Fe-based ferromagnets, $\mathrm{La}({\mathrm{Fe}}_{x}{\mathrm{Si}}_{1\ensuremath{-}x}{)}_{13}$ compounds are the first example realizing the itinerant-electron metamagnetic transition from the paramagnetic to the ferromagnetic state, accompanied by a marked magnetovolume effects. The effect of pressure on the Curie temperature is one order larger than that on the spontaneous magnetization in analogy with the results for Fe-Pt invar-type alloys. The large pressure coefficient of ${T}_{\mathrm{C}},$ $d\mathrm{ln}{T}_{\mathrm{C}}/dP,$ is attributed to the renormalization effect caused by spin fluctuations for free energy. The metamagnetic transition and the marked magnetovolume effects in the present compounds are related to the characteristic $3d$ band structures in analogy with Fe-Pt alloys in both the ferromagnetic and paramagnetic states.
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