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

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

2011-05-09

arxiv.org/abs/1105.1587v1

Phys. Rev. B 82, 214109 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, 7 figures

Scientific paper

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

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