Josephson-Coupling Origin for the Upward Curvature of the Pseudo-Upper-Critical Field in Bi2Sr2−xLaxCuO6+δ Crystals
H. H. Wen, W. L. Yang, Z. X. Zhao, Y. M. Ni
DOI 10.1103/PhysRevLett.82.410 · Physical Review Letters
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Abstract
By measuring the temperature dependence of the diamagnetic moment for La-doped Bi2Sr2−xLaxCuO6+δ singe crystals, we observed two superconducting transitions on each sample. With increasing magnetic field, the transition at the high temperature Tc1 shifts very slowly, while the transition at the low temperature Tc2 shifts dramatically, showing a clear upward curvature of the critical field. It is found that the transition corresponding to Tc1 is described very well by the critical fluctuation theory with a very steep −dHc2/dT near Tc1, while that corresponding to Tc2 can be described by a recent theory by Geshkenbein, Ioffe, and Millis [Phys. Rev. Lett. 80, 5778 (1998)] indicating strong evidence of a Josephson-coupling origin.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | onset |
| Bi2Sr2-xLaxCuO6+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 16 | Pressure not reported | onset |
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