Ginzburg-Landau equation and the upper critical field in anisotropic (d+s)-wave superconductivity
K. Maki, M. T. Beal-Monod
DOI 10.1103/PhysRevB.55.11730 · Physical Review B
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Abstract
We have proposed earlier a (d+s)-wave superconductivity model to account for the high-Tc cuprates that exhibit an orthorhombic distortion. Within this model, we derive here the Ginzburg-Landau equation microscopically. Included are the a-b anisotropy terms which already exist in the normal phase, using an anisotropic mass model. We calculate the upper critical field Hc2 in the cases where the applied magnetic field B is parallel to the c axis or in the a-b plane. In this last case, we obtain a simple expression for Hc2 which is a function of cos(2θ) where θ is the angle B makes from the a axis. In particular, for YBCO(123) we predict Hc2b/Hc2a =3.15, which is much larger than the one reported in a recent experiment.
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. | — | Pressure not reported | unknown |
| Nd2-xCexCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 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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