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

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

preprint2011arXivOpen access
J. HwangT. KolodiazhnyiJ. YangM. Couillard
cond-mat.str-el
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J. HwangT. KolodiazhnyiJ. YangM. Couillard

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