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| Hauptseite > Publikationsdatenbank > Thermodynamic Ground States of Complex Oxide Heterointerfaces > print |
| Hauptseite > Publikationsdatenbank > Thermodynamic Ground States of Complex Oxide Heterointerfaces > print |
| 001 | 826338 | ||
| 005 | 20210129225602.0 | ||
| 024 | 7 | _ | |a 10.1021/acsami.6b12706 |2 doi |
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| 100 | 1 | _ | |a Gunkel, F. |0 P:(DE-Juel1)130677 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Thermodynamic Ground States of Complex Oxide Heterointerfaces |
| 260 | _ | _ | |a Washington, DC |c 2017 |b Soc. |
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| 520 | _ | _ | |a The formation mechanism of 2-dimensional electron gases (2DEGs) at heterointerfaces between nominally insulating oxides is addressed with a thermodynamical approach. We provide a comprehensive analysis of the thermodynamic ground states of various 2DEG systems directly probed in high temperature equilibrium conductivity measurements. We unambiguously identify two distinct classes of oxide heterostructures: For epitaxial perovskite/perovskite heterointerfaces (LaAlO3/SrTiO3, NdGaO3/SrTiO3, and (La,Sr)(Al,Ta)O3/SrTiO3), we find the 2DEG formation being based on charge transfer into the interface, stabilized by the electric field in the space charge region. In contrast, for amorphous LaAlO3/SrTiO3 and epitaxial γ-Al2O3/SrTiO3 heterostructures, the 2DEG formation mainly relies on the formation and accumulation of oxygen vacancies. This class of 2DEG structures exhibits an unstable interface reconstruction associated with a quenched nonequilibrium state. |
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