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Experiments on several Y-Co samples near the 4:3 composition show an onset to ferromagnetic order below 10K after an appropriate heat treatment of the samples. The ferromagnetic order is strongly suppressed with the application of hydrostatic pressures of a few kilobars. The results suggest a sensitive preparation dependence of the samples for superconductivity. The superconducting transition temperature as derived from AC susceptibility measurements, has a positive pressure dependence of 0.10+or-0.01 K kbar -1 .
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Liet et al. (1982) studied this question.
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