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| Hauptseite > Publikationsdatenbank > Space charges and defect concentration profiles at complex oxide interfaces > print |
| Hauptseite > Publikationsdatenbank > Space charges and defect concentration profiles at complex oxide interfaces > print |
| 001 | 810924 | ||
| 005 | 20230426083135.0 | ||
| 024 | 7 | _ | |a 10.1103/PhysRevB.93.245431 |2 doi |
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| 037 | _ | _ | |a FZJ-2016-03490 |
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| 100 | 1 | _ | |a Gunkel, Felix |0 P:(DE-Juel1)130677 |b 0 |e Corresponding author |u fzj |
| 245 | _ | _ | |a Space charges and defect concentration profiles at complex oxide interfaces |
| 260 | _ | _ | |a College Park, Md. |c 2016 |b APS |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a We discuss electronic and ionic defect concentration profiles at the conducting interface between the two wide-band-gap insulators LaAlO3 and SrTiO3 (STO). The profiles are deduced from a thermodynamic model considering a local space charge layer (SCL) originating from charge transfer to the interface region, thus combining electronic and ionic reconstruction mechanisms. We show that the electrical potential confining the two-dimensional electron gas (2DEG) at the interface modifies the equilibrium defect concentrations in the SCL. For the n-conducting interface, positively charged oxygen vacancies are depleted within the SCL, while negatively charged strontium vacancies accumulate. Charge compensation within the SCL is achieved by a mixed ionic-electronic interface reconstruction, while the competition between 2DEG and localized ionic defects is controlled by ambient pO2. The concentration of strontium vacancies increases drastically in oxidizing conditions and exhibits a steep depth profile towards the interface. Accounting for the low cation diffusivity in STO, we also discuss kinetic limitations of cation defect formation and the effect of a partial equilibration of the cation sublattice. We discuss the resulting implications for low temperature transport |
| 536 | _ | _ | |a 521 - Controlling Electron Charge-Based Phenomena (POF3-521) |0 G:(DE-HGF)POF3-521 |c POF3-521 |f POF III |x 0 |
| 542 | _ | _ | |i 2016-06-27 |2 Crossref |u http://link.aps.org/licenses/aps-default-license |
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| 700 | 1 | _ | |a Waser, R. |0 P:(DE-Juel1)131022 |b 1 |u fzj |
| 700 | 1 | _ | |a Ramadan, Amr H. H. |0 P:(DE-HGF)0 |b 2 |
| 700 | 1 | _ | |a De Souza, Roger A. |0 P:(DE-HGF)0 |b 3 |
| 700 | 1 | _ | |a Hoffmann-Eifert, Susanne |0 P:(DE-Juel1)130717 |b 4 |u fzj |
| 700 | 1 | _ | |a Dittmann, Regina |0 P:(DE-Juel1)130620 |b 5 |u fzj |
| 773 | 1 | 8 | |a 10.1103/physrevb.93.245431 |b American Physical Society (APS) |d 2016-06-27 |n 24 |p 245431 |3 journal-article |2 Crossref |t Physical Review B |v 93 |y 2016 |x 2469-9950 |
| 773 | _ | _ | |a 10.1103/PhysRevB.93.245431 |g Vol. 93, no. 24, p. 245431 |0 PERI:(DE-600)2844160-6 |n 24 |p 245431 |t Physical review / B |v 93 |y 2016 |x 2469-9950 |
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