Upper critical fields of high-Tc superconducting Y2−xBaxCuO4−y
T. P. Orlando, K. A. Delin, S. Foner, E. J. McNiff, Jr., J. M. Tarascon, L. H. Greene, W. R. McKinnon, G. W. Hull
DOI 10.1103/PhysRevB.35.7249 · Physical Review B
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Abstract
We have measured the upper critical field Bc2(T) of Y2−xBaxCuO4−y with x=0.4 near Tc in dc fields up to 20 T and at 77 K with pulsed fields to 45 T. The data yield (dBc2/dT)T=Tc=1.3 T/K and Tc=89.5 K for the midpoint of the resistive transitions, and (dBc2/dT)T=Tc=5±1 T/K and Tc=95.1 K for the onset. The estimates for Bc2(0) range from 80 to 320 T. Pulsed-field data suggest that a fraction of the material is still superconducting above 45 T at 77 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y2-xBaxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 89.5 | Pressure not reported | midpoint |
| Y2-xBaxCuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95.1 | Pressure not reported | onset |
| La1.85Sr0.15CuO4-y 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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