Upper critical fields and anisotropy limits of high-Tc superconductors R1Ba2Cu3O7−y, where R=Nd,Eu,Gd,Dy,Ho,Er,andTm, and YBa2Cu3O7−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.36.2394 · Physical Review B
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Abstract
The upper critical fields Bc2(T) were measured up to 28 T for R1Ba2Cu3O7−y, where R=Nd,Eu,Gd,Dy,Ho,Er,andTm, and for YBa2Cu3O7−y. The midpoints (dBc2dT)T=Tc cluster about (2.8±0.2) T/K, the Tc's=(93±2) K show a slight systematic decrease from Nd to Tm, and the extrapolated values of Bc2(0) cluster about (160±20) T. The wide range of normal-state resistivities indicates that they are not intrinsic to the superconductor. The anisotropy A=Bc2∥Bc2⊥ is estimated to be less than 12 based on the data for the resistive transition. Criteria for the midpoint resistive transition are also reexamined.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NdBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | midpoint |
| EuBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | midpoint |
| GdBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | midpoint |
| DyBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | midpoint |
| HoBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | midpoint |
| ErBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | midpoint |
| TmBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | midpoint |
| YBa2Cu3O7-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91.4 | Pressure not reported | midpoint |
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