Journal
PHYSICAL REVIEW LETTERS
Volume 117, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.117.037002
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Funding
- Sciex-NMSch - Swiss Confederation [13.236]
- University of Tennessee's Science Alliance Joint Directed Research and Development (JDRD) program
- Oak Ridge National Laboratory
- University of Tennessee's Office of Research & Engagement's Organized Research Unit program
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We investigate the band structure of BaBiO3, an insulating parent compound of doped high-T-c superconductors, using in situ angle-resolved photoemission spectroscopy on thin films. The data compare favorably overall with density functional theory calculations within the local density approximation, demonstrating that electron correlations are weak. The bands exhibit Brillouin zone folding consistent with known BiO6 breathing distortions. Though the distortions are often thought to coincide with Bi3+/Bi5+ charge ordering, core level spectra show that bismuth is monovalent. We further demonstrate that the bands closest to the Fermi level are primarily oxygen derived, while the bismuth 6s states mostly contribute to dispersive bands at deeper binding energy. The results support a model of Bi-O charge transfer in which hole pairs are localized on combinations of the O 2p orbitals.
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