Nature of the states near the Fermi level of the layered superconductors of Bi2Ca1Sr2Cu2O8 and Bi2Sr2CuO6
Z. -X. Shen, P. A. P. Lindberg, P. Soukiassian, C. B. Eom, I. Lindau, W. E. Spicer, T. H. Geballe
DOI 10.1103/PhysRevB.39.823 · Physical Review B
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Abstract
Photoemission spectroscopy using synchrotron radiation has been used to investigate the electronic structure of the Bi2Ca1Sr2Cu2O8 and the Bi2Sr2CuO6 superconductors. The states near the Fermi level EF, as observed in photoemission spectroscopy in these two compounds, have less Cu character than the La1.8Sr0.2CuO4 and the YBa2Cu3O7 superconductors. We suggest the coexistence of bandlike p states of Bi-O origin and correlated Cu3p−O2p bands. The p bands of Bi-O are occupied differently in the Bi2Ca1Sr2Cu2O8 and the Bi2Sr2CuO6 superconductors, resulting in a different density of states near EF and a slightly different valency of the Bi ions in the two compounds. We point out the correlation between the difference in the density of states near EF and the difference in the superconducting transition temperatures of the Bi2Ca1Sr2Cu2O8 and the Bi2Sr2CuO6 superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2CaSr2Cu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
| Bi2Sr2CuO6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
| La1.8Sr0.2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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