Anisotropic nature of high-temperature superconductivity in single-crystal Y1Ba2Cu3O7−x
T. K. Worthington, W. J. Gallagher, T. R. Dinger
DOI 10.1103/PhysRevLett.59.1160 · Physical Review Letters
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Abstract
We report the first contact-free measurements of the upper critical fields, Hc2(T), of single-crystal Y1Ba2Cu3O7−x. In contrast to resistive measurements reported by others, we find that the anisotropy near Tc is temperature independent in agreement with the expectations of anisotropic Ginzburg-Landau theory. Estimates of the anisotropic Ginzburg-Landau and London parameters are reported. These indicate that despite the large anisotropy in Hc2 (5:1), the inferred low-temperature interplanar coherence length (ξz=7 Å) remains larger than the Cu-O layer spacing of 3.9 Å. The superconductivity in Y1Ba2Cu3O7−x thus remains fundamentally three dimensional in nature for a substantial temperature range below Tc.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1Ba2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88.8 | Pressure not reported | onset |
| La2-xBaCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 35 | Pressure not reported | unknown |
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