Abstract
The temperature dependence of the electrical resistivity was measured for face-centered cubic (fcc) Fe70Ni30 Invar alloy under high pressure between 2 and 8 GPa. It was found that the electrical resistivity below 6 GPa shows a minimum at a low temperature around 10 K (= Tmin), which decreases with increasing pressure and disappears at 8 GPa. At 8 GPa, the electrical resistivity is proportional to T2 below 30 K, which indicates the Fermi liquid property. The resistance minimum is caused by a new high-pressure magnetic phase such as a RSG phase. These results show the pressure-induced magnetic phase transition from the ferromagnetic phase to the RSG phase below 6 GPa and a crossover from the RSG phase to Fermi liquid around 8 GPa.
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