We have studied the effect of pressure on the pyrochlore iridate
Eu2​Ir2​O7​, which at ambient pressure has a thermally driven insulator
to metal transition at TMI​∼120\,K. As a function of pressure the
insulating gap closes, apparently continuously, near P∼6\,GPa. However,
rather than TMI​ going to zero as expected, the insulating ground state
crosses over to a metallic state with a negative temperature coefficient of
resistivity, calling into question the true nature of both ground states. The
high temperature state also crosses over near 6 GPa, from an incoherent to a
conventional metal, suggesting a connection between the high and the low
temperature states.Comment: 7 pages, 7 figures, updated after publication in Physical Review