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Optical Response of High-Dielectric-Constant Perovskite-Related Oxide
Abstract
Optical conductivity measurements on the perovskite-related oxide CaCu 3 Ti 4 O 12 provide a hint of the physics underlying the observed giant dielectric effect in this material. A low-frequency vibration displays anomalous behavior, implying that there is a redistribution of charge within the unit cell at low temperature. At infrared frequencies (terahertz), the value for the dielectric constant is ∼80 at room temperature, which is far smaller than the value of ∼10 5 obtained at lower radio frequencies (kilohertz). This discrepancy implies the presence of a strong absorption at very low frequencies due to dipole relaxation. At room temperature, the characteristic relaxation times are fast (≲500 nanoseconds) but increase dramatically at low temperature, suggesting that the large change in dielectric constant may be due to a relaxor-like dynamical slowing down of dipolar fluctuations in nanosize domains.
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Cited by
Electron-pinned defect-dipoles for high-performance colossal permittivity materials
Hu, W., Liu, Y., Withers, R. L., Frankcombe, T. J., Norén, L., Snashall, A., Kitchin, M., Smith, P., Gong, B., Chen, H., et al. (2013) · Nature Materials · doi:10.1038/nmat3691 · Cited by 1,117
Colossal Permittivity Materials as Superior Dielectrics for Diverse Applications
Wang, Y., Jie, W., Yang, C., Wei, X., & Hao, J. (2019) · Advanced Functional Materials · doi:10.1002/adfm.201808118 · Cited by 283
Copper (II) oxide as a giant dielectric material
Sarkar, S., Jana, P. K., Chaudhuri, B. K., & Sakata, H. (2006) · Applied Physics Letters · doi:10.1063/1.2393001 · Cited by 160
Metadata
- Authors
- Homes, C. C., Vogt, T., Shapiro, S. M., Wakimoto, S., & Ramirez, A. P.
- Venue
- Science
- Published
- 2001-07-27
- Volume
- 293
- Issue
- 5530
- Pages
- 673-676
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2098151249
- Cited by
- 1,734
- References
- 0
- FWCI
- 18.33
- Type
- journal article
- Language
- en
- Open access
- closed
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- Homes, C. C., Vogt, T., Shapiro, S. M., Wakimoto, S., & Ramirez, A. P. (2001). Optical Response of High-Dielectric-Constant Perovskite-Related Oxide. Science. https://doi.org/10.1126/science.1061655
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