Abstract
The thermal expansion of was measured under pressures up to 20 kbar. The large positive magnetovolume effect, caused by the onset of the Mn magnetism, is found to be shifted towards lower temperatures with pressure, and vanishes around 15 kbar. Above this pressure only the Gd sublattice shows long-range magnetic order. Between 6 and 15 kbar the Gd and Mn sublattices order separately. The pressure-induced splitting of the ordering temperatures is ascribed to the Mn magnetism instability, which is observed for certain compounds.
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