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

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 $T_{M I} \sim 120$ ,K. As a function of pressure the insulating gap closes, apparently continuously, near $P \sim 6$ ,GPa. However, rather than $T_{M I}$ 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.

Pressure Tuned Insulator to Metal Transition in Eu $_{2}$ Ir $_{2}$ O $_{7}$

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Pressure Tuned Insulator to Metal Transition in Eu $_{2}$ Ir $_{2}$ O $_{7}$

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Pressure Tuned Insulator to Metal Transition in Eu22​Ir22​O77​

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Pressure Tuned Insulator to Metal Transition in Eu22​Ir22​O77​

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Pressure Tuned Insulator to Metal Transition in Eu $_{2}$ Ir $_{2}$ O $_{7}$

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Pressure Tuned Insulator to Metal Transition in Eu $_{2}$ Ir $_{2}$ O $_{7}$

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