Abstract
In framework of systematic study of the 5f-band metamagnet UCoAl, we report on magnetic properties of quasiternary UCo1−xPtxAl compounds. Although UPtAl is a ferromagnet, the initial substitutions of Pt for Co (x≤0.05) cause gradual suppression of the “UCoAl-type” metamagnetism. Compounds with 0.05<x≤0.20 are paramagnetic without any sign of metamagnetism in fields up to 5 T. UCo0.7Pt0.3Al exhibits ferromagnetic ordering below 8 K, (the critical Pt concentration for the onset of ferromagnetism is 0.2<xc<0.3). Both the uranium magnetic moment and the Curie temperature monotonously increase with further increasing Pt content. Evolution of magnetism in UCo1−xPtxAl series is discussed in the context of other quasiternary UCo1−xTxAl systems (T=Fe, Ni, Ru) studied so far.
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