The low-temperature infrared optical functions of SrTiO3 determined by reflectance spectroscopy and spectroscopic ellipsometry

Kamarás, Katalin; Barth, Karl; Keilmann, F.; Henn, R.; Reedyk, M.; Thomsen, C.; Cardona, M.; Kircher, J.; Richards, P. L.; Stehle, Jean-Louis P.

doi:10.1063/1.360364

Cited by 117 publications

(58 citation statements)

References 22 publications

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“…Optical phonon parameters determined by the fitting were listed in Table 2. Parameters for STO were consistent with the result in the literature, 29 confirming the reliability of the analysis.…”

supporting

confidence: 88%

Ultra Wide Range Dielectric Spectroscopy of Strontium Titanate-Strontium Zirconate Solid Solution

Tsurumi

Teranishi

Wada

et al. 2006

J. Ceram. Soc. Japan

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The dielectric properties vary significantly with the B-site cations in ABO 3 perovskite-type oxides. In this study, we tried to understand the difference in the dielectric properties between SrTiO 3 STO, e r 290, Qf 3000 GHz and SrZrO 3 SZO, e r 30, Qf 13700 GHz by measuring the dielectric spectroscopy of their solid solutions in a wide frequency range. The dielectric permittivity and the loss tangent tan d of SrZr x Ti 1 x O 3 STZ, 0.0x 1.0 ceramics were evaluated up to a GHz region using the planer electrode method and ring resonator method. The four-parameter-semi-quantum FPSQ model was employed to analyze the Infrared-reflectivity IR-reflectivity data of the STZ ceramics. Both dielectric properties up to the GHz region and IR reflectivity in the THz region were incorporated in the analysis to accurately determine the optical phonon parameters. Ultra wide band dielectric spectra of the SZT ceramics and the STO single crystal were presented. The ionic polarization dominantly determined the dielectric permittivity of the SZT ceramics and the STO single crystal. High permittivity of STO was due to the Slater mode. The decrease of dielectric permittivity and the Q-factor 1tan d with an increasing Zr content x in STZ ceramics was attributed to the depression of the Slater mode. The effect of the optical phonon parameters on the permittivity and tan d in the microwave region was simulated to generalize the results obtained for the STZ ceramics.

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supporting

confidence: 88%

Ultra Wide Range Dielectric Spectroscopy of Strontium Titanate-Strontium Zirconate Solid Solution

Tsurumi

Teranishi

Wada

et al. 2006

J. Ceram. Soc. Japan

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“…5a followed the temperature dependence reported in Ref. 11, but no additional structure in the range of interest was seen.…”

Section: C-axis Plasma Frequencysupporting

confidence: 77%

Interlayer tunneling mechanism: experimental test of single-layer compounds

et al. 1998

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The c-axis optical properties of cuprate superconductors have been studied by grazing angle reflectivity technique. We tested the interlayer tunnelling (ILT) model of high temperature superconductivity and showed that the basic relation between the condensation energy of the superconducting state and the interlayer Josephson coupling does not hold for T12Ba2CuO6 . Measuring the reflectivity at an oblique angle of incidence on the ab-surface of T12Ba2CuO6, we found the c-axis plasma resonance at 28 cm . The corresponding Josephson coupling energy is at least an order of magnitude lower than the condensation energy determined from the specific heat measurements. In the double layer compound Tl2Ba2CaCu2O8 the c-axis plasma resonance was observed at 26 cm1 . The c-axis penetration depth and the c-axis conductivity follow the Ambegaokar-Baratoff or "dirty limit" superconductor relation if a very small energy gap is assumed.

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“…Figure 5 shows the THz dielectric permittivities measured using the farinfrared spectroscopic ellipsometer. The responses of the Slater, Last, and Axe modes, 34), 35) which are all optical phonon modes of SrTiO 3 at room temperature, were clearly observed for all samples. The Slater mode, which is the soft mode of SrTiO 3 , represents the mutual oscillation between the Ti ion and the rigid O 6 octahedra.…”

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confidence: 86%

Effect of oxygen vacancies on intrinsic dielectric permittivity of strontium titanate ceramics

Hoshina

Sase

Nishiyama

et al. 2018

J. Ceram. Soc. Japan

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We prepared oxygen-deficient strontium titanate ceramics and measured the THz dielectric spectra to discuss the effect of oxygen vacancies on the intrinsic dielectric permittivity. In the presence of oxygen vacancies, the lattice volume of strontium titanate increased. First-principles calculation revealed that the expansion of the lattice originated from repulsion between the oxygen vacancies and cations, causing a decrease in the covalency of the TiO bonding. THz dielectric measurement using a far-infrared spectroscopic ellipsometer made it clear that the Slater-type phonon mode hardened and then the intrinsic permittivity of strontium titanate decreased in the presence of oxygen vacancies.

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The low-temperature infrared optical functions of SrTiO3 determined by reflectance spectroscopy and spectroscopic ellipsometry

Cited by 117 publications

References 22 publications

Ultra Wide Range Dielectric Spectroscopy of Strontium Titanate-Strontium Zirconate Solid Solution

Ultra Wide Range Dielectric Spectroscopy of Strontium Titanate-Strontium Zirconate Solid Solution

Interlayer tunneling mechanism: experimental test of single-layer compounds

Effect of oxygen vacancies on intrinsic dielectric permittivity of strontium titanate ceramics

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