Surface barrier and lower critical field of the powdered Pr1.85Ce0.15CuO3.98 superconductor
D.-X. Chen, A. Varela, A. Hernando, J. M. González-Calbet, M. Vallet
DOI 10.1103/PhysRevB.53.5160 · Physical Review B
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Abstract
The saturation magnetization loops of Pr1.85Ce0.15CuO3.98 n-type superconducting powder have been measured at different temperatures. The paramagnetic susceptibility χpara is about 3×10−3. The superconducting component is fitted by an extended critical-state model, so that the lower critical field, Hc1, and the first field for vortex entry, H1, are determined. Their overall behavior is similar to those of p-type Bi-based compounds; Hc1(T) is almost linear and surface barriers appear below 12 K, above which anomalies occur. A unique feature is that at 18 K (≊Tc) although the superconducting magnetization becomes very small Hc1 is still large (2 kA/m). This indicates the presence of minor phases with much higher Tc. © 1996 The American Physical Society.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Pr1.85Ce0.15CuO3.98 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | unknown |
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