Physics – Condensed Matter – Superconductivity
Scientific paper
2004-02-12
Physical Review B 68 (2003) 094517
Physics
Condensed Matter
Superconductivity
subitted to PRB, 15 pages, 3 figures
Scientific paper
10.1103/PhysRevB.69.134511
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+d)2/(CaCuO2)n and (Ba0.9Nd0.1CuO2+d)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.
Balestrino G.
Marré Daniele
Medaglia P. G.
Pallecchi Ilaria
Putti Marina
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