Electrochemical oxygen intercalation into Sr$_2$IrO$_4$

L. Fruchter 1, * V. Brouet 1 D. Colson 2 J.-B. Moussy 2 A. Forget 2 Z.Z. Li 1
* Corresponding author
2 LNO - Laboratoire Nano-Magnétisme et Oxydes
SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay
Abstract : Oxygen was electrochemically intercalated into Sr$_2$IrO$_4$ sintered samples, single crystals and a thin film. We estimate the diffusion length to a few μm and the concentration of the intercalated oxygen to δ ≃ 0.01. The latter is thus much smaller than for the cuprate and nickelate parent compounds, for which δ > 0.1 is obtained, which could be a consequence of larger steric effects. The influence of the oxygen doping state on resistivity is small, indicating also a poor charge transfer to the conduction band. It is shown that electrochemical intercalation of oxygen may also contribute to doping, when gating thin films with ionic liquid in the presence of water.
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L. Fruchter, V. Brouet, D. Colson, J.-B. Moussy, A. Forget, et al.. Electrochemical oxygen intercalation into Sr$_2$IrO$_4$. Journal of Physics and Chemistry of Solids, Elsevier, 2018, 112, pp.1 - 7. ⟨10.1016/j.jpcs.2017.08.032⟩. ⟨cea-01687752⟩



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