Abstract
UPtAl exhibits ferromagnetic ordering (T C = 42.5 K) of uranium 5f-electron moments. The magnetic ordering transition is accompanied by an electrical-resistivity (ρ) anomaly at Curie temperature (T C). We report on resistivity measurements performed in a wide temperature range on a UPtAl single crystal under hydrostatic pressures p ≤ 8 GPa. The initial increase of T C with p becomes gradually reduced for p > 2 GPa. The maximum T C value is reached between 4 and 6 GPa that is followed by a decrease of T C beyond 6 GPa. The latter result is attributed to the approaching collapse of U 5f moment ferromagnetism.
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