Paraconductivity and excess Hall effect in epitaxial YBa2Cu3O7 films induced by superconducting fluctuations
W. Lang, G. Heine, P. Schwab, X. Z. Wang, D. Bäuerle
DOI 10.1103/PhysRevB.49.4209 · Physical Review B
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Abstract
Measurements of the temperature dependence of the electrical resistivity and the Hall effect in epitaxial films of YBa2Cu3O7 are reported. The resistivity is close to linear in T and the cotangent of the Hall angle proportional to T2 at temperatures sufficiently above Tc. Deviations from this behavior near Tc are attributed to thermodynamic fluctuations and are analyzed in terms of theories for direct (Aslamazov-Larkin) and indirect (Maki-Thompson) fluctuation contributions in a layered superconductor. We obtain an unequivocal fit to both paraconductivity and excess-Hall-effect data with a consistent set of three parameters, i.e., the c-axis coherence length ξc(0)=1.5 Å, the phase-relaxation time τφ=8.6×10−14 s at 100 K, and the electron-hole asymmetry parameter β=-0.17. We observe a sign change of the excess Hall effect close to Tc, when the Aslamazov-Larkin process becomes dominant.
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. | 88.55 | Pressure not reported | onset |
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