AI Article Synopsis
- The study examines Mott gap excitations in the high-temperature superconductor YBa(2)Cu(3)O(7-delta) using resonant inelastic x-ray scattering, revealing anisotropic spectral behaviors.
- Notably, excitations from the CuO chain are enhanced at 2 eV near the b* zone boundary, while those from the CuO2 plane display a broad spectrum between 1.5-4 eV, showing little dependence on momentum transfer.
- Theoretical models suggest that varying on-site Coulomb energy values can accurately reproduce the observed excitation spectra, with the Mott gap for the CuO chain being significantly smaller than that for the CuO2 plane.
Article Abstract
Mott gap excitations in the optimally doped high-T(c) superconductor YBa(2)Cu(3)O(7-delta) (T(c)=93 K) have been studied by the resonant inelastic x-ray scattering method. Anisotropic spectra in the ab plane are observed in a twin-free crystal. The excitation from the one-dimensional CuO chain is enhanced at 2 eV near the zone boundary of the b* direction, while the excitation from the CuO2 plane is broad at 1.5-4 eV and almost independent of the momentum transfer. Theoretical calculations based on the one-dimensional and two-dimensional Hubbard model reproduces the observed spectra when different values of the on-site Coulomb energy are assumed. The Mott gap of the CuO chain site is found to be much smaller than that of the CuO2 plane site.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.94.187002 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!