Superconductivity and electronic structure of Bi-based compounds
S. Thomas, P. M. A. Sherwood, N. Singh, A. Al-Sharif, M. J. O’Shea
DOI 10.1103/PhysRevB.39.6640 · Physical Review B
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Abstract
We have prepared superconducting Bi-based compounds by sintering and find a weak diamagnetic response at 110 K and a strong diamagnetic response at about 80 K. The dominant structural phase was identified by x-ray diffraction to be Bi2SrCa2Cu2O8−y and low-field magnetization indicates that approximately 60% (by volume) of the sample is superconducting. Xα and other calculations to interpret the copper binding energies and satellite features of high-Tc superconductors are presented, and these calculations suggest that while x-ray photoemission spectroscopy (XPS) can distinguish between Cu i and Cu ii, it may not be able to unambiguously identify Cu iii. We also find that copper reduction during the XPS experiment further complicates copper oxidation state determination.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2SrCa2Cu2O8-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | onset |
| Bi2SrCa2Cu2O8-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 110 | Pressure not reported | onset |
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