Evidence of thermal nucleation of two-dimensional point vortices in single-crystal Nd1.85Ce0.15Cu2O4−y superconductors
F. Zuo, S. Khizroev, Xiuguang Jiang, J. L. Peng, R. L. Greene
DOI 10.1103/PhysRevB.49.12326 · Physical Review B
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Abstract
We report detailed magnetic measurements in H parallel to the c-axis direction on a single crystal of Nd1.85Ce0.15Cu2O4−y. The magnetization data indicate that the entrance field is determined by surface barriers. At low temperatures, the penetration field Hp(T) can be fit with Hp=Hcexp(-T/T0); at temperature close to Tc, Hp(T) is linear in T. The date can be qualitatively understood by a model where two-dimensional point vortices are thermally nucleated near the surface in weakly coupled layered superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd1.85Ce0.15Cu2O4-y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | onset |
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