Insights from Angle-Resolved Photoemission Spectroscopy of an Undoped Four-Layered Two-Gap High-Tc Superconductor
Wenhui Xie, O. Jepsen, O. K. Andersen, Yulin Chen, Z.-X. Shen
DOI 10.1103/PhysRevLett.98.047001 · Physical Review Letters
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Abstract
An undoped cuprate with apical fluorine and inner (i) and outer (o) CuO2 layers is a 60 K superconductor whose Fermi surface has large n- and p-doped sheets with the superconducting gap on the n sheet twice that on the p sheet. The Fermi surface is not reproduced by the local density approximation, but the screening must be substantially reduced due to electronic correlations, and oxygen in the o layers must be allowed to dimple outwards. This charges the i layers by 0.01|e|, causes a 0.4 eV Madelung-potential difference between the i and o layers, quenches the i−o hopping, and localizes the n sheets onto the i layers, thus protecting their d-wave pairs from being broken by scattering on impurities in the BaF layers. The correlation-reduced screening strengthens the coupling to z-axis phonons.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ba2Ca3Cu4O8F2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
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