Phase change observed in ultrathin Ba0.5Sr0.5TiO3 films by <i>in situ</i> resonant photoemission spectroscopy
Phase change observed in ultrathin Ba0.5Sr0.5TiO3 films by <i>in situ</i> resonant photoemission spectroscopy
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. The results demonstrated an abrupt …