Nature of oxygen dopant-induced states in high-temperature Bi2Sr2CaCu2O8+x superconductors: A photoemission investigation
P. Richard, Z.-H. Pan, M. Neupane, A. V. Fedorov, T. Valla, P. D. Johnson, G. D. Gu, W. Ku, Z. Wang, H. Ding
DOI 10.1103/PhysRevB.74.094512 · Physical Review B
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Abstract
We investigate the nature of oxygen dopant-induced electronic states in the high-temperature Bi2Sr2CaCu2O8+x superconductor by measuring photoemission spectra of underdoped, optimally doped, and overdoped samples using a wide photon energy range (15–100eV). We find a small and broad nondispersive peak at −0.8eV associated with oxygen dopants. Surprisingly, the detailed analysis of the resonance profile suggests a mixing with Cu states. Particularly, the A1g symmetry revealed by polarization-dependent experiments and the comparison with the single-layered Bi2Sr2CuO6+x indicates that the oxygen dopant-induced states are mixed to the superconducting CuO2 planes through the oxygen dopant—apical oxygen O2pz—Cu3d3z2−r2 channel.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 71 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 70 | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
| Bi2Sr2CuO6+x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
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