Critical current measurements in superconductor-ferromagnet-superconductor junctions of YBa2Cu3Oy-SrRuO3-YBa2Cu3Oy: No evidence for dominant proximity-induced triplet superconductivity in the ferromagnetic barrier
G. Koren, T. Kirzhner, P. Aronov
DOI 10.1103/PhysRevB.85.024514 · Physical Review B
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Abstract
Transport measurements in ramp-type junctions of YBa2Cu3Oy−SrRuO3−YBa2Cu3Oy with Tc values of either 80–90 K or 60–70 K are reported. In both types of junctions but without a barrier (“shorts”), the supercurrent densities at 4.2 K reached 7.5 and 3.5 MA/cm2, respectively, indicating the high quality of the fabrication process. Plots of the critical current versus thickness of the ferromagnetic barrier at 4.2 K show exponential decays with decay lengths of 1.1 nm for the 90-K phase and 1.4 nm for the 60-K phase, which are much shorter than the relevant coherence lengths ξF∼5–6 nm or ξN∼16 nm of SrRuO3. We thus conclude that there is no dominant proximity induced triplet superconductivity in the ferromagnet in our junctions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
| YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 70 | Pressure not reported | zero_resistance |
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