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- W69521350 abstract "The electronic structure of the iron-based superconductor ${mathrm{Ba}}_{2}{mathrm{Ti}}_{2}{mathrm{Fe}}_{2}{mathrm{As}}_{4}mathrm{O}$ (${T}_{c}^{text{onset}}=23.5text{ }text{ }mathrm{K}$) has been investigated by using angle-resolved photoemission spectroscopy and combined local density approximation and dynamical mean field theory calculations. The electronic states near the Fermi level are dominated by both the Fe $3d$ and Ti $3d$ orbitals, indicating that the spacer layers separating different FeAs layers are also metallic. By counting the enclosed volumes of the Fermi surface sheets, we observe a large self-doping effect; i.e., 0.25 electrons per unit cell are transferred from the FeAs layer to the ${mathrm{Ti}}_{2}{mathrm{As}}_{2}mathrm{O}$ layer, leaving the FeAs layer in a hole-doped state. This exotic behavior is successfully reproduced by our dynamical mean field calculations, in which the self-doping effect is attributed to the electronic correlations in the $3d$ shells. Our work provides an alternative route of effective doping without element substitution for iron-based superconductors." @default.
- W69521350 created "2016-06-24" @default.
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- W69521350 date "2014-12-31" @default.
- W69521350 modified "2023-10-15" @default.
- W69521350 title "Correlation-Induced Self-Doping in the Iron-Pnictide Superconductor<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msub><mml:mi>Ba</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ti</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Fe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>As</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mi mathvariant=normal>O</mml:mi></mml:math>" @default.
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- W69521350 doi "https://doi.org/10.1103/physrevlett.113.266407" @default.
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