Oscillatory Superconducting Transition Temperature in Nb/Gd Multilayers
J. S. Jiang, D. Davidović, Daniel H. Reich, C. L. Chien
DOI 10.1103/PhysRevLett.74.314 · Physical Review Letters
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Abstract
The superconducting transition temperature Tc in Nb/Gd multilayers shows a pronounced nonmonotonic dependence on the ferromagnetic Gd layer thickness dGd for fixed Nb thickness dNb. For dNb=500 and 600 Å, the Tc oscillation occurs in the range 10≤dGd≤40 Å where the Gd ferromagnetism is well established. These results provide the first evidence for the predicted π phase in superconductor/ferromagnet multilayers where the order parameter in neighboring superconducting layers may have an intrinsic phase difference.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.8 | Pressure not reported | unknown |
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