Ginzburg-Landau coefficients for high-Tc superconductors with a deformable-lattice model
Stephen Nettel
DOI 10.1103/PhysRevB.50.16090 · Physical Review B
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Abstract
In previous work estimates showed that observed static deformations of their crystal lattices into soft modes can explain observed high values of Tc in La2−xBaxCuO4 and YBa2Cu3O7−δ. In a different calculation dealing with conventional superconductivity an attempt was made to derive the Ginzburg-Landau (GL) equations from microscopic BCS wave functions. Combining these developments, the origin of the anomalously high values of the GL coefficients α and β characterizing high-Tc materials is indicated here. Good agreement with experiments for GL quantities ξ and λL is obtained for YBa2Cu3O7−δ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | unknown |
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