Pressure Tuned Insulator to Metal Transition in Eu${}_2$Ir${}_2$O${}_7$

Abstract

We have studied the effect of pressure on the pyrochlore iridate Eu${}_2$Ir${}_2$O${}_7$, which at ambient pressure has a thermally driven insulator to metal transition at $T_{MI}\sim 120$\,K. As a function of pressure the insulating gap closes, apparently continuously, near $P\sim 6$\,GPa. However, rather than $T_{MI}$ 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.

7 pages, 7 figures, updated after publication in Physical Review B

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