Abstract
The borocarbide series (RC) m (NiB) n (R=rare earth, Y; m, n=1 or 2) has attracted much interest since the R=Lu, m=1, n=2 compound was found to display superconductivity near 16.5 K. While the m=1, n=2 systems display not only superconductivity, but also heavy electron behaviour (Yb) and various forms of magnetic order, the series with m= n=1 has not been investigated as extensively. Here we summarise the results of transport and magnetic measurements on GdNiBC from which we infer the presence of two transitions (as in GdNi 2B 2C) rather than a single anomaly found in earlier studies. However, susceptibility data on a powdered specimen display a single peaked structure reminiscent of that reported previously, suggesting that the present arc-melted materials may develop orientational texture. Furthermore, magnetoresistance measurements on the latter reveal an enhanced response with ( ρ(0)− ρ( H))/ ρ(0) exceeding 33% near 10 K in fields of 8 T.
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