Interlayer coupling effect in high-Tc superconductors probed by YBa2Cu3O7−x/PrBa2Cu3O7−x superlattices
Q. Li, X. X. Xi, X. D. Wu, A. Inam, S. Vadlamannati, W. L. McLean, T. Venkatesan, R. Ramesh, D. M. Hwang, J. A. Martinez, L. Nazar
DOI 10.1103/PhysRevLett.64.3086 · Physical Review Letters
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Abstract
The effect of coupling between layers of the high-Tc superconductors was studied by varying both the YBa2Cu3O7−x and PrBa2Cu3O7−x layer thicknesses in YBa2Cu3O7−x/PrBa2Cu3O7−x superlattices. Superconductivity was found even when the YBa2Cu3O7−x layers had nominal thicknesses as small as 12 Å (one unit-cell thickness) but coupling between unit-cell layers is needed to achieve a Tc of 90 K. The decrease of Tc in isolated YBa2Cu3O7−x layers with increasing sheet resistance is on the same scale of about ħ/e2 as observed for ordinary superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 90 | Pressure not reported | onset |
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