Measurements of Δ and vF from Andreev reflections and McMillan-Rowell oscillations in edge junctions of YBa2Cu3O6.6/YBa2Cu2.55Fe0.45Oy/YBa2Cu3O6.6
O. Nesher, G. Koren
DOI 10.1103/PhysRevB.60.9287 · Physical Review B
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Abstract
We report measurements of dynamic resistance of high quality oxygen deficient SNS edge junctions with YBa2Cu3O6.6 (Tc=60 K) as the superconductor (S) and YBa2Cu2.55Fe0.45Oy as the barrier (N). Below the gap a series of peaks in the dynamic resistance is identified as due to multiple Andreev reflections in the barrier (Vn=2Δ/en), while above the gap, the peaks are attributed to McMillan-Rowell oscillations (ΔV=hvF′/4edN). Analysis of the subgap series in the 60 K YBa2Cu3O6.6 yields a gap value Δa−b of 16±1.5 meV, and a coupling constant 2Δ/kTc of 6.2±0.5. The McMillan-Rowell series yield the renormalized Fermi velocity of quasiparticles in the barrier vF′=(1.5±0.1)×107 cm/sec.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O6.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 60 | Pressure not reported | unknown |
| YBa2Cu2.55Fe0.45Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | onset |
| YBa2Cu3O6.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 63 | Pressure not reported | unknown |
| YBa2Cu3O6.6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 66 | Pressure not reported | unknown |
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