Stacking structure and superconductivity in ruthenium-iridium bicrystal superlattices
Roy Clarke, F. Lamelas, C. Uher, C. P. Flynn, J. E. Cunningham
DOI 10.1103/PhysRevB.34.2022 · Physical Review B
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Abstract
The stacking structure and epitaxial ordering are studied in molecular-beam-epitaxy-grown Ru-Ir superlattices of wavelengths λ=10, 41, and 62 Å. These samples span the fcc-hcp crossover previously found to occur when the Ir component is thinner than about 10 monolayers. Evidence for a new stacking sequence of period 3λ is found in the λ=41 Å sample, possibly resulting from stacking faults in the Ir layers. The superconducting transition temperature is significantly higher in the 41-Å sample (Tc=0.19 K) than in the 62-Å sample (Tc=0.15 K), whereas the 10-Å sample is not superconducting down to 20 mK.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ru-Ir Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.19 | Pressure not reported | unknown |
| Ru-Ir Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.15 | Pressure not reported | unknown |
| Ru Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.49 | Pressure not reported | unknown |
| Ir Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.14 | Pressure not reported | unknown |
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