Upper critical field of a Sm1.85Ce0.15CuO4−y single crystal: Interaction between superconductivity and antiferromagnetic order in copper oxides
Y. Dalichaouch, B. W. Lee, C. L. Seaman, J. T. Markert, M. B. Maple
DOI 10.1103/PhysRevLett.64.599 · Physical Review Letters
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Abstract
The temperature dependence of the anisotropic upper critical magnetic field, Hc2(T), has been determined resistively in antiferromagnetic Sm1.85Ce0.15CuO4−y single crystals. We observe the first evidence in high-Tc copper oxides for the interaction between superconductivity and antiferromagnetic ordering of rare-earth ions; estimates of the exchange coupling J≊0.1 eV and the Ginzburg-Landau coherence lengths ξab=79 Å and ξc=14.7 Å are obtained. In both Nd1.84Ce0.16CuO4−y and Sm1.85Ce0.15CuO4−y, the Hc2 data above TN can be described by Hc2(T)/Hc2+(0)=(1-T/Tc)1.6.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Sm1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.4 | Pressure not reported | midpoint |
| Nd1.84Ce0.16CuO4-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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