Abstract
High-pressure techniques were used to determine the structural behaviour of thesuperconducting ferromagnet UCoGe up to 30 GPa enabling us to determine the linkbetween the effect of pressure on the material magnetic properties and crystal structure.The TiNiSi type structure of UCoGe was preserved up to the highest pressure. Thea direction, equivalent to the shortest U–U links, was identified as the critical softdirection. The data are compared with the structural variations in UCoGeα-hydride, which becomes non-magnetic and non-superconducting despite a volumeexpansion. We show that at least in this case, but probably more generally, thestructure impact of hydrogenation is definitely not equivalent to negative pressure.
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