Role of the Cu-O charge-transfer energy in the superconductivity of cuprates: Evidence from Cu 2p core-level spectroscopy and theory
C. N. R. Rao, G. Ranga Rao, M. K. Rajumon, D. D. Sarma
DOI 10.1103/PhysRevB.42.1026 · Physical Review B
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Abstract
Based on Cu 2p core-level spectroscopy and theoretical calculations, it has been demonstrated that the Cu-O charge-transfer excitation energy which determines the Cu 2p satellite intensity also plays a crucial role in the superconductivity of cuprates. The relative intensity of the satellite generally decreases with an increase in the Tc or in the hole concentration in a given series of cuprate superconductors. In the case of Bi2Ca1−xRxSr2Cu2O8+δ (R=rare earth), the satellite intensity goes through a minimum around the same composition where the hole concentration as well as the Tc show maxima.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Ca1-xRxSr2Cu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi1.5Pb0.5(Ca,Sr)n+1CunO2n+4+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Tl2Can-1Ba2CunO2n+4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TlCa1-xNdxSr2Cu2O7+δ 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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