Magnetic properties of Lu2Fe16X (X = Fe, Ni, Cr, Si) intermetallics under high hydrostatic pressure

We present very significant effects of a partial substitution of Ni, Cr and Si for Fe on magnetic and magnetoelastic properties of the mother Lu2Fe17 intermetallics. The ferromagnetic state is stabilized by the substitution in all the Lu2Fe16X (X = Ni, Cr, Si) intermetallics. Their Curie temperature TC is by about 100 K higher than the Néel temperature TN of Lu2Fe17. The magnetoelastic phenomena of the Lu2Fe16X single crystals were studied under high hydrostatic pressure using a non-magnetic pressure CuBe cell in a SQUID magnetometer. The effect of pressure on TC of the Lu2Fe16X intermetallics coincides with changes of TC that are induced by hydrogenation in Lu2Fe17Hx. Pressure induced changes of saturated magnetization MS of Lu2Fe16X depend on a kind of X-element and generally, they are several times smaller than those in Lu2Fe17. Magnetocrystalline anisotropy of Lu2Fe17 is strongly reduced by the substitution of Cr for Fe only.