Superconducting fluctuation diamagnetism above Tc in YBa1Cu3O7, La1.8Sr0.2CuO4, and Bi2−xPbxSr2CaCu2O8+δ
W. C. Lee, R. A. Klemm, D. C. Johnston
DOI 10.1103/PhysRevLett.63.1012 · Physical Review Letters
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Abstract
Magnetic susceptibility data are presented for the title compounds. All show negative curvature below ∼2Tc. Data for grain-aligned YBa2Cu3O7 are in excellent agreement with a new calculation of the superconducting fluctuation diamagnetism. We infer s-wave pairing and Ginzburg-Landau coherence lengths ξab(0)=13.6±0.8 Å and ξc(0)=1.23±0.19 Å. Both of the order-parameter bands are found to be essential in the fit. Part of the above negative curvature is inferred to arise from the normal-state background.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.5 | Pressure not reported | zero_resistance |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | 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 |
| Bi2-xPbxSr2CaCu2O8+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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