DOI: 10.1126/science.1061655. Optical Response of High-Dielectric-Constant Perovskite-Related Oxide

Optical Response of High-Dielectric-Constant Perovskite-Related Oxide

10.1126/science.1061655

Crossref journal-article

American Association for the Advancement of Science (AAAS)

Science (221)

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.

Bibliography

Homes, C. C., Vogt, T., Shapiro, S. M., Wakimoto, S., & Ramirez, A. P. (2001). Optical Response of High-Dielectric-Constant Perovskite-Related Oxide. Science, 293(5530), 673â676.

Authors 5

C. C. Homes (first)
T. Vogt (additional)
S. M. Shapiro (additional)
S. Wakimoto (additional)
A. P. Ramirez (additional)

References 19 Referenced 1,629

M. A. Subramanian Dong Li
Duan N., Reisner B. A., Sleight A. W., J. Solid State Chem. 151, 323 (2000). (10.1006/jssc.2000.8703) / J. Solid State Chem. by Duan N. (2000)
Ramirez P., et al., Solid State Commun. 115, 217 (2000). (10.1016/S0038-1098(00)00182-4) / Solid State Commun. by Ramirez P. (2000)
Singh R., Ulrich R. K., Electrochem. Soc. Interface 8, 26 (1999). (10.1149/2.F06992IF) / Electrochem. Soc. Interface by Singh R. (1999)
Kim B.-G., Cho S. M., Kim T.-Y., Jang H. M., Phys. Rev. Lett. 86, 3404 (2001). (10.1103/PhysRevLett.86.3404) / Phys. Rev. Lett. by Kim B.-G. (2001)
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The transport measurements were performed at Lucent Technologies Bell Labs 600 Mountain Avenue Murray Hill NJ 07974 USA.
V. V. Daniel Dielectric Relaxation (Academic Press New York 1967) pp. 4–19.
Homes C. C., Reedyk M., Crandles D. A., Timusk T., Appl. Opt. 32, 2972 (1993). (10.1364/AO.32.002976) / Appl. Opt. by Homes C. C. (1993)
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We thank D. Buttrey J. F. Scott A. W. Sleight D. Vanderbilt R. Werner and P. Woodward for fruitful discussions. The work at Brookhaven was supported by the U.S. Department of Energy under contract no. DE-AC02-98CH10886. The work at MIT was supported by NSF under grant no. DMR0071256 and by the MRSEC Program of NSF under award no. DMR98-08941.

Dates

Type	When
Created	19 years, 5 months ago (March 28, 2006, 8:37 a.m.)
Deposited	1 year, 7 months ago (Jan. 9, 2024, 12:10 p.m.)
Indexed	2 days, 12 hours ago (Aug. 31, 2025, 6:26 a.m.)
Issued	24 years, 1 month ago (July 27, 2001)
Published	24 years, 1 month ago (July 27, 2001)
Published Print	24 years, 1 month ago (July 27, 2001)

Funders 0

None

BibTeX

@article{Homes_2001, title={Optical Response of High-Dielectric-Constant Perovskite-Related Oxide}, volume={293}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.1061655}, DOI={10.1126/science.1061655}, number={5530}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Homes, C. C. and Vogt, T. and Shapiro, S. M. and Wakimoto, S. and Ramirez, A. P.}, year={2001}, month=jul, pages={673–676} }

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  "abstract": "<jats:p>\n            Optical conductivity measurements on the perovskite-related oxide CaCu\n            <jats:sub>3</jats:sub>\n            Ti\n            <jats:sub>4</jats:sub>\n            O\n            <jats:sub>12</jats:sub>\n            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 \u223c80 at room temperature, which is far smaller than the value of \u223c10\n            <jats:sup>5</jats:sup>\n            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 (\u2272500 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.\n          </jats:p>",
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