Momentum-Resolved Electronic Structure of the High-Tc Superconductor Parent Compound BaBiO3

We investigate the band structure of BaBiO3, an insulating parent compound of doped high-Tc 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, d...

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Bibliographic Details
Published in:Physical review letters 2016-07, Vol.117 (3)
Main Authors: Plumb, Nc, Gawryluk, Dj, Wang, Y, Ristic, Z, Park, J, Lv, Bq, Wang, Z, Matt, Ce, Xu, N, Shang, T, Conder, K, Mesot, J, Johnston, S, Shi, M, Radovic, M
Format: Article
Language:English
Subjects:
Bismuth
Charge
Charge transfer
Distortion
Orbitals
Order disorder
Parents
Superconductors
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Summary:We investigate the band structure of BaBiO3, an insulating parent compound of doped high-Tc 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.117.037002