Magnetic properties of polycrystalline R1.5Ce0.5Sr2Cu2NbO10 (R=Eu, Nd, and Sm) high-Tc superconducting ceramics
M. Bennahmias, A. F. Bello, D. Back, H. B. Radousky, T. J. Goodwin, P. Klavins, R. N. Shelton
DOI 10.1103/PhysRevB.48.6525 · Physical Review B
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Abstract
Magnetic characterization has been performed on the superconducting members of the R1.5Ce0.5Sr2Cu2NbO10 (R=Eu, Nd, and Sm) series. These materials are related to the YBa2Cu3O7−δ structure through the replacement of the CuO chains with NbO2 planes, and the single rare-earth elements with a R2O2 fluorite structure. Measurements of the lower critical-field curve, irreversibility line, volume fraction, Meissner fraction, and magnetic relaxation are reported for each compound. No evidence of intergrain weak-link behavior down to 0.1 Oe is observed. Estimates of the zero-field intragrain critical current density from high-field hysteresis curves taken at 6 K for the Nd-, Sm-, and Eu-based systems are 2.7×104, 3.3×104, and 4.7×104 A/cm2, respectively.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd1.5Ce0.5Sr2Cu2NbO10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | unknown |
| Eu1.5Ce0.5Sr2Cu2NbO10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25 | Pressure not reported | unknown |
| Sm1.5Ce0.5Sr2Cu2NbO10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | unknown |
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