Temperature-dependent AC conductivities of BiCuOCh (Ch = Te, Se) in the terahertz range

Hee Jun Shin, Tae Ho An, Young Soo Lim, Chan Park, Jeong Pil Song, Joo Hiuk Son

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We investigated the temperature-dependent optical conductivity of BiCuOCh (Ch = Te, Se) in the terahertz (THz) region. The optical conductivity of BiCuOSe increases with the temperature from 297 to 600 K, whereas that of BiCuOTe exhibits a different trend. In the THz frequency range of 0.4–1.6 THz, these materials show a conductivity increase as the frequency increases. The conductivity of BiCuOTe is greater than that of BiCuOSe. These results can be explained by a two-band structure model and the carrier-carrier scattering process. In addition, we fitted the experimental results to the Drude–Smith model to explain non-Drude like behavior. The dielectric constant of BiCuOTe depends on the frequency rather than on the temperature, whereas that of BiCuOSe depends on the temperature.

Original languageEnglish
Pages (from-to)1303-1307
Number of pages5
JournalCurrent Applied Physics
Volume16
Issue number10
DOIs
StatePublished - 1 Oct 2016

Keywords

  • Conductivity
  • Dielectric constant
  • Terahertz spectroscopy
  • Thermoelectric

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