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We investigated the dielectric functions $\epsilon$($\omega$) of Ir, Ru, Pt,and IrO$_2$, which are commonly used as electrodes in ferroelectric thin filmapplications. In particular, we investigated the contributions from boundcharges $\epsilon^{b}$($\omega$), since these are important scientifically aswell as technologically: the $\epsilon_1^{b}$(0) of a metal electrode is one ofthe major factors determining the depolarization field inside a ferroelectriccapacitor. To obtain $\epsilon_1^{b}$(0), we measured reflectivity spectra ofsputtered Pt, Ir, Ru, and IrO2 films in a wide photon energy range between 3.7meV and 20 eV. We used a Kramers-Kronig transformation to obtain real andimaginary dielectric functions, and then used Drude-Lorentz oscillator fittingsto extract $\epsilon_1^{b}$(0) values. Ir, Ru, Pt, and IrO$_2$ producedexperimental $\epsilon_1^{b}$(0) values of 48$\pm$10, 82$\pm$10, 58$\pm$10, and29$\pm$5, respectively, which are in good agreement with values obtained usingfirst-principles calculations. These values are much higher than those fornoble metals such as Cu, Ag, and Au because transition metals and IrO$_2$ havesuch strong d-d transitions below 2.0 eV. High $\epsilon_1^{b}$(0) values willreduce the depolarization field in ferroelectric capacitors, making thesematerials good candidates for use as electrodes in ferroelectric applications.Comment: 26 pages, 6 figures, 2 table

physical review. b, condensed matter and materials physics

Dielectric constants of Ir, Ru, Pt, and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>IrO</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>: Contributions from bound charges

Dielectric constants of Ir, Ru, Pt, andIrO2: Contributions from bound charges