Possible role of the alkaline-earth ions in high-temperature superconductivity
Maria Ronay, D. M. Newns
DOI 10.1103/PhysRevB.39.819 · Physical Review B
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Abstract
In high-temperature superconductors with Tc exceeding the temperature of liquid nitrogen, there is no conventional isotope shift. This suggests an unconventional pairing mechanism, but we notice a systematic upward "polarizability shift" in Tc. The shift in Tc of about 20% occurs in the 1:2:3, 2:2:1:2, and 2:2:2:3 high-temperature superconducting compounds when the more polarizable Ba replaces Sr. A semiquantitative calculation enables us to interpret our result in the framework of the two-hole resonance mechanism. The role of the alkaline-earth ion is to partially screen the electron-electron Coulomb repulsion U, lowering the energy of the d8 state and hence increasing Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | unknown |
| YSrCaCu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80.5 | Pressure not reported | unknown |
| YSrCu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 80 | Pressure not reported | unknown |
| Tl2Ba2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 106 | Pressure not reported | unknown |
| Bi2Sr2CaCu2Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | unknown |
| Tl2Ba2Ca2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 125 | Pressure not reported | unknown |
| Bi2Sr2Ca2Cu3Ox Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 105 | Pressure not reported | unknown |
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