Physics – Condensed Matter – Materials Science
Scientific paper
2007-05-24
Appl. Phys. Lett. 90, 222909 (2007)
Physics
Condensed Matter
Materials Science
13 pages, 4 figures
Scientific paper
10.1063/1.2745249
Epitaxial Ba0.5Sr0.5TiO3 thin films were prepared on Nb-doped SrTiO3 (100)substrates by the pulsed laser deposition technique, and were studied by measuring the Ti 2p - 3d resonant photoemission spectra in the valence-band region as a function of film thickness, both at room temperature and low temperature. Our results demonstrated an abrupt variation in the spectral structures between 2.8 nm (~7 monolayers) and 2.0 nm (~5 monolayers) Ba0.5Sr0.5TiO3 films, suggesting that there exists a critical thickness for phase change in the range of 2.0 nm to 2.8 nm. This may be ascribed mainly to the intrinsic size effects.
Fujimori Atsushi
Fujimori S.-I.
Hwang Ing-Jye
Kobayashi Koji
Kobayashi Mari
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