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Effects of pressure P on the magnetic moment M and the Curie temperature T C have been investigated for La(Fe x Si 1-x ) 13 above and below the magnetic phase boundary concentration x = 0.86, where the ferromagnetic-paramagnetic transition at T C changes from the first-order (x ≥ 0.86) to the second-order (x < 0.86). The pressure coefficient ofM exhibits a sluggish variation against concentration and no anomaly was observed at x = 0.86, being consistent with the Landau expansion model. On the other hand, T C for the second-order transition has a large negative pressure coefficient dT C /dP and its magnitude increases with increasing x. Above x = 0.86, the magnitude of dT C /dP for the first-order transition increases with x, contrary to the theoretical expectation. It has been revealed that the spin-wave dispersion coefficient becomes smaller when the first-order transition becomes clear by changing the concentration and also applying pressure. Consequently, it is plausible that dTc/dP above x = 0.86 is enhanced by the increase of instability of the ferromagnetic state.

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Concentration Dependence of Pressure Effect in La(Fe&lt;I&gt;&lt;SUB&gt;x&lt;/SUB&gt;&lt;/I&gt;Si&lt;SUB&gt;1&amp;minus;&lt;I&gt;x&lt;/I&gt;&lt;/SUB&gt;)&lt;SUB&gt;13&lt;/SUB&gt; Compounds