Transport critical current in rare-earth-substituted superconductors RBa2Cu3O7−δ (R=Gd, Dy, Sm, Ho, Y)
S. Jin, R. A. Fastnacht, T. H. Tiefel, R. C. Sherwood
DOI 10.1103/PhysRevB.37.5828 · Physical Review B
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Abstract
We have measured the transport critical current densities (Jc) of various bulk polycrystalline RBa2Cu3O7−δ-type high-temperature superconductors (R=Gd,Dy,Sm,Ho,Y) at 77 K as a function of magnetic field. The substitution of yttrium with magnetic rare-earth elements resulted in no appreciable improvement or deterioration in the transport Jc values (typically in the range 200–600 A/cm2 at H=0). The similar Jc values of all five barium cuprate compounds and their rapid deterioration in weak magnetic fields in a similar manner (Jc<10 A/cm2 at H=1000 gauss) suggest the possibility of generic ‘‘weak link’’ problems in these compounds.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| GdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | Pressure unresolved | onset |
| GdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | zero_resistance |
| DyBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | Pressure unresolved | onset |
| DyBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure unresolved | zero_resistance |
| SmBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure unresolved | onset |
| SmBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure unresolved | zero_resistance |
| HoBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 95 | Pressure unresolved | onset |
| HoBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure unresolved | zero_resistance |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | Pressure unresolved | onset |
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 91 | Pressure unresolved | zero_resistance |
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