Origin of the electronic states near the Fermi level in high-Tc superconductors
A. Fujimori, Y. Tokura, H. Eisaki, H. Takagi, S. Uchida, M. Sato
DOI 10.1103/PhysRevB.40.7303 · Physical Review B
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Abstract
We have studied superconducting and insulating Cu-oxide systems by photoemission spectroscopy. The emission feature near the Fermi level EF for Bi2(Sr,Ca)3Cu2O8+δ remains unchanged when hole carriers are depleted by Y substitution for Ca. A similar feature is observed also for insulating Sr2CuO2Cl2. These facts suggest that the feature near EF in the Bi compounds is due to states which are split off out of the oxygen p band, possibly through hybridization with Cu d8 states, and cannot be due to a Kondo-type resonance and resulting renormalized heavy-electron band states. Other origins for the states near EF in La2−xSrxCuO4 and YBa2Cu3O7−δ are also discussed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | onset |
| Bi2(Sr,Ca)3Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
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