Abstract
We report on 5 7 Fe-Mossbauer studies of the magnetic properties in ScFe 2 and Sc 0 . 4 Ti 0 . 6 Fe 2 performed as a function of pressure and temperature. Both systems crystallize in the C14-type Laves phase structure with two different Fe sites 6h and 2a. The ferromagnetic properties of ScFe 2 (T C = 540 K at ambient pressure) change around 30 GPa to antiferromagnetic order of the 6h sites with non-magnetic 2a sites. The ordering temperature is lowered to T N = 300 K at 51 GPa. This pressure-dependent behaviour of ScFe 2 resembles that observed within the Sc 1 - x Ti x Fe 2 series as a function of x. In ferromagnetic Sc 0 . 4 Ti 0 . 6 Fe 2 we observe, as a function of temperature and of pressure, an abrupt high-moment to low-moment transition of the Fe band moments of the 6h sites, accompanied by a rearrangement of the spin directions. In both systems the decrease in the Fe moments is accompanied by a strong increase in the volume coefficient of the isomer shift, originating from a reduced s-electron shielding capability of the d-electrons in the low-moment state.
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