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The electrical transport properties of [BaCuO_x]_2/[CaCuO_2]_n(CBCCO-2xn)underdoped high temperature superconducting superlattices grown byPulsed Laser Deposition have been investigated. Starting from the optimallydoped CBCCO-2x2 superlattice, having three CuO_2 planes and T_c around 80 K, wehave systematically increased the number n up to 15 moving toward theunderdoped region and hence decreasing T_c. For n>11 the artificial structuresare no longer superconducting, as expected, for a uniformly distributed chargecarriers density inside the conducting block layer. The sheet resistance ofsuch artificial structures (n nearly equal to 11) turns out to be quitetemperature independent and close to the 2D quantum resistance 26 kOhm. Afurther increase of the number of CuO_2 planes results in an insulator-typedependence of R(T) in the wide range of temperatures from room temperature to 1K. The value of the sheet resistance separating the Superconducting and theInsulating regimes supports the fermionic scenario of theSuperconductor-Insulator transition in these systems.Comment: 12 pages, 5 figures. Corresponding author: Simone.Lavanga@uniroma2.i

physical review. b, condensed matter

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Superconducting properties of[BaCuOx]2/[CaCuO