Ferroelectric-like metallic state in electron doped BaTiO3

J. Fujioka, A. Doi, D. Okuyama, D. Morikawa, T. Arima, K. N. Okada, Y. Kaneko, T. Fukuda, H. Uchiyama, D. Ishikawa, A. Q.R. Baron, K. Kato, M. Takata, Y. Tokura

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Abstract

We report that a ferroelectric-like metallic state with reduced anisotropy of polarization is created by the doping of conduction electrons into BaTiO 3, on the bases of x-ray/electron diffraction and infrared spectroscopic experiments. The crystal structure is heterogeneous in nanometer-scale, as enabled by the reduced polarization anisotropy. The enhanced infrared intensity of soft phonon along with the resistivity reduction suggests the presence of unusual electron-phonon coupling, which may be responsible for the emergent ferroelectric structure compatible with metallic state.

Original languageEnglish
Article number13207
JournalScientific reports
Volume5
DOIs
Publication statusPublished - 2015 Aug 20
Externally publishedYes

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    Fujioka, J., Doi, A., Okuyama, D., Morikawa, D., Arima, T., Okada, K. N., Kaneko, Y., Fukuda, T., Uchiyama, H., Ishikawa, D., Baron, A. Q. R., Kato, K., Takata, M., & Tokura, Y. (2015). Ferroelectric-like metallic state in electron doped BaTiO3. Scientific reports, 5, [13207]. https://doi.org/10.1038/srep13207