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Eu2Ir2O7, a candidate Weyl semimetal, shows an insulator-to-metal transitionas a function of Bi substitution at the Eu site. In this work, we investigatethe (Eu_1-xBi_x)2Ir2O7 series via Hard X-ray Photoemission Spectroscopy(HAXPES), where substitution of larger Bi3+ for Eu3+ is reported to result inan anomalous lattice contraction (20 %) for low Bi doping (3.5 %). UsingHAXPES, we confirm that all the cations retain their nominal valence statethroughout the series. The asymmetric nature of Bi core-level spectra forcompositions in the metallic region indicates that Bi contributes to thedensity of states at the Fermi energy in this doping range. The valence bandspectra shows that the Bi 6s peak is unaltered throughout the series and issituated deep within the valence band. based on these observations we arguethat Bi 6p - Ir 5d hybridization drives the insulator-to-metal transition.

Insulator-to-metal transition in the pyrochlore iridates series (Eu_1-xBi_x)2Ir2O7 probed using Hard X-ray Photoemission Spectroscopy