Field-Dependent Diamagnetic Transition in Magnetic Superconductor Sm1.85Ce0.15CuO4−y
R. Prozorov, D. D. Lawrie, I. Hetel, P. Fournier, R. W. Giannetta
DOI 10.1103/PhysRevLett.93.147001 · Physical Review Letters
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Abstract
The magnetic penetration depth of single crystal Sm1.85Ce0.15CuO4−y was measured down to 0.4 K in dc fields up to 7 kOe. For insulating Sm2CuO4, Sm3+ spins order at the Néel temperature, TN=6 K, independent of the applied field. Superconducting Sm1.85Ce0.15CuO4−y (Tc≈23 K) shows a sharp increase in diamagnetic screening below T*(H) which varied from 4.0 K (H=0) to 0.5 K (H=7 kOe) for a field along the c axis. If the field was aligned parallel to the conducting planes, T* remained unchanged. The unusual field dependence of T* indicates a spin-freezing transition that dramatically increases the superfluid density.
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. | 23 | Pressure not reported | unknown |
| Nd1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Pr1.85Ce0.15CuO4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| ErNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| SmRh4B4 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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