Abstract
We have performed a study of the magnetic properties of UT 2Si 2 (T = Ni, Cu and Au) compounds by means of measurements of the temperature, T, dependence of the low-frequency ac magnetic susceptibility χ ac and electrical resistivity ρ. The χ ac data clearly shows that (1) a magnetic first-order transition takes place near 97 K in UNi 2Si 2; (2) a weak magnetic anomaly near 104 K precedes the onset of a much stronger ferromagnetic transition at ≈ 97 K in UCu 2Si 2; and (3) two magnetic transitions occur in UAu 2Si 2, one with onset at 44 K and the other with onset at 18 K. The ρ versus T data reveals (1) a small drop near 104 K for UCu 2Si 2 followed by a faster decline with T below 100 K; and (2) the transition near 44 K does not affect the behavior of ρ versus T, while the transition at 18 K is accompanied by a sharp increase in ρ with decreasing T followed by a sharp depression below 18 K.
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