Mapping the magnetic and electronic structure of (Eu1-xCa1-x)2Ir2O7 across a global metal-insulator transition
Motivated by the prediction of quantum critical behavior with the suppression of the temperature dependent metal-insulator transition in Ln2Ir2O7 (Ln = Y, lanthanide), including the formation of a topological semi-metal phase, we present characterization of polycrystalline samples for the series (Eu1-xCa1-x)2Ir2O7. Doping completely suppresses the MIT with only a weak decrease in the magnetic transition, leading to a fully metallic state that retains the bulk magnetism of the x = 0 compound. XRD and XAS suggest that the change of TMIT occurs due to an interplay between bandwidth tuning via a change in the Ir-O-Ir bond angle as well as filling control. X-ray PDF shows no changes in short-range order associated with either the MIT or the magnetic transition, additionally confirming that Ca-doping does not result in significant phase separation. Preliminary XMCD data probing the magnetic state across the MIT will be discussed.''.This work was supported by ARO Grant W911NF-16-1-0361.
APS March Meeting Abstracts
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