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arXiv · 2103.03056

Origin of the different electronic structure of Rh- and Ru-doped Sr2IrO4

Véronique Brouet·Paul Foulquier·Alex Louat·François Bertran·Patrick Le Fèvre·Julien E. Rault·Dorothée Colson
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Abstract

One way to induce insulator to metal transitions in the spin-orbit Mott insulator Sr2IrO4 is to substitute iridium with transition metals (Ru, Rh). However, this creates intriguing inhomogeneous metallic states, which cannot be described by a simple doping effect. We detail the electronic structure of the Ru-doped case with angle-resolved photoemission and show that, contrary to Rh, it cannot be connected to the undoped case by a rigid shift. We further identify bands below $E_F$ coexisting with the metallic ones that we assign to non-bonding Ir sites. We rationalize the differences between Rh and Ru by a different hybridization with oxygen, which mediates the coupling to Ir and sensitively affects the effective doping. We argue that the spin-orbit coupling does not control neither the charge transfer nor the transition threshold.

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Véronique Brouet, Paul Foulquier, Alex Louat, François Bertran, Patrick Le Fèvre, Julien E. Rault, Dorothée Colson. 2021-03-04. Origin of the different electronic structure of Rh- and Ru-doped Sr2IrO4. https://doi.org/10.1103/physrevb.104.l121104

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