Doping and temperature-dependent optical properties of oxygen-reduced BaTiO3-d

J. Hwang; T. Kolodiazhnyi; J. Yang; M. Couillard

doi:10.1103/PhysRevB.82.214109

Doping and temperature-dependent optical properties of oxygen-reduced BaTiO3-d

Strongly Correlated Electrons 2015-05-28 v1

Authors: J. Hwang , T. Kolodiazhnyi , J. Yang , M. Couillard

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Abstract

We report on optical properties of reduced BaTiO3-d at different doping levels including insulating and metallic samples. In all the samples, including metallic one, we observe structural phase transitions from the changes in the infrared-active phonon modes. Metallic ground state is confirmed by the Drude-type lowfrequency optical reflectance. Similar to SrTiO3-d we find that the midinfrared-absorption band in BaTiO3-d appears and grows with an increase in the oxygen-vacancy concentration. Upon decrease in temperature from 300 K, the midinfrared band shifts slightly to higher frequency and evolves into two bands: the existing band and a new and smaller band at lower frequency. The appearance of the new and smaller band seems to be correlated with the structural phase transitions

Keywords

BaTiO3-d optical properties oxygen vacancy structural phase transition Drude reflectance midinfrared absorption band

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@article{arxiv.1105.1587,
  title  = {Doping and temperature-dependent optical properties of oxygen-reduced BaTiO3-d},
  author = {J. Hwang and T. Kolodiazhnyi and J. Yang and M. Couillard},
  journal= {arXiv preprint arXiv:1105.1587},
  year   = {2015}
}

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8 pages, 7 figures

Doping and temperature-dependent optical properties of oxygen-reduced BaTiO3-d

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