Analysis of the charge transfer mechanism on (Ba1−xNdxCuO2+δ)2/(CaCuO2)n superconducting superlattices by thermoelectric power measurements
M. Putti, D. Marré, I. Pallecchi, P. G. Medaglia, A. Tebano, G. Balestrino
DOI 10.1103/PhysRevB.69.134511 · Physical Review B
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Abstract
We have investigated the charge transfer mechanism in artificial superlattices by Seebeck effect measurements. Such a technique allows a precise determination of the amount of charge transferred on each CuO2 plane. A systematic characterization of thermoelectric power in (BaCuO2+δ)2/(CaCuO2)n and (Ba0.9Nd0.1CuO2+δ)2/(CaCuO2)n superlattices demonstrates that electrical charge distributes uniformly among the CuO2 planes in the Ca block. The differences observed in the Seebeck effect behavior between the Nd-doped and undoped superlattices are ascribed to the different metallic character of the Ba block in the two cases. Finally, the special role of structural disorder in superlattices with n=1 is pointed out by such analysis.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BaCuO2)2/(CaCuO2)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 69 | Pressure not reported | onset |
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