| Pressure dependence of the ferromagnetic to antiferromagnetic transition in Fe3(Ga1-xAlx)4 with x=0.0 and 0.1 (1999) | |||||||||
Abstract | |||||||||
| The ferromagnetic to antiferromagnetic transition in Fe3Ga4 is studied by means of ac-susceptibility measurements under chemical and external hydrostatic pressure. Substitution of Al for Ga results in an increase of the ferromagnetic to antiferromagnetic transition temperature (T0) of 4.1~4! K/at.% Al. Application of hydrostatic pressures up to 7 kbar also yields a positive effect: dT0 /dp 53.4(4) K/kbar. The external-pressure-induced increase of T0 in Fe3~Ga0.9Al0.1)4 is considerably weaker: dT0 /dp50.93(10) K/kbar. Thermal-expansion measurements reveal that the volume change at the ferromagnetic to antiferromagnetic transition DV/V amounts to only 0.02%. We believe that the volume effect in conjunction with a shift in the Fermi level drives the ferromagnetic to antiferromagnetic transition. The details of the band structure at the Fermi surface determine the magnetic properties and may give rise to the strong pressure dependence of T0. | |||||||||
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