Influence of the ferroelectric polarization on the electronic structure of BaTiO3 thin films
| Autor: | Barrett, N., Rault, J., Krug, I., Vilquin, B., Niu, G., Gautier, B., Albertini, D., Renault, O. |
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| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Surace and Interface Analysis, 42 1690-1694 (2010) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1002/sia.3369 |
| Popis: | Micrometric domains of precise ferroelectric polarization have been written into a 20 nm thick epitaxial thin film of BaTiO3(001) (BTO) on a Nb doped SrTiO3 (STO) substrate using PiezoForce Microscopy (PFM). The domain dependent electronic structure has been studied using fully energy-filtered PhotoEmission Microscopy (PEEM) and synchrotron radiation. Shifts, induced by ferroelectric polarization, of up to 300 meV are observed in the work function of the sample. The surface is Ba-O terminated. Polarization-induced distortion of the electronic structure is observed in the valence band and on the Ba 3d, Ti 2p and O 1s core levels of BTO. Polarization dependent surface adsorption is observed. A simple electrostatic model based on net surface charge is not sufficient to explain the observed modifications in the electronic levels. Comment: 5 pages, 7 figures |
| Databáze: | arXiv |
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