Superconducting properties of [BaCuOx]2/[CaCuO2]n artificial structures with ultrathick CaCuO2 blocks
G. Balestrino, S. Lavanga, P. G. Medaglia, S. Martellucci, A. Paoletti, G. Pasquini, G. Petrocelli, A. Tebano, A. A. Varlamov, L. Maritato, M. Salvato
DOI 10.1103/PhysRevB.62.9835 · Physical Review B
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Abstract
The electrical transport properties of [BaCuOx]2/[CaCuO2]n(CBCCO−2×n) underdoped high-temperature superconducting superlattices grown by pulsed laser deposition have been investigated. Starting from the optimally doped CBCCO−2×2 superlattice, having three CuO2 planes and Tc around 80 K, we have systematically increased the number n up to 15 moving toward the underdoped region and hence decreasing Tc. For n>11 the artificial structures are no longer superconducting, as expected, for a uniformly distributed charge carrier density inside the conducting block layer. The sheet resistance of such artificial structures (n≈11) turns out to be quite temperature independent and close to the two-dimensional quantum resistance 26 kΩ. A further increase of the number of CuO2 planes results in an insulator-type dependence of R(T) in the wide range of temperatures from room temperature to 1 K. The value of the sheet resistance separating the superconducting and the insulating regimes supports the fermionic scenario of the superconductor-insulator transition in these systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaCuOx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CaCuO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2YxCa1-xCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Y1Ba2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Nd2-xCexCu1O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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