7 November 2002 Artificial high-temperature superconducting structures
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(BaCuO2+δ)m/(CaCuO2)2 superconducting artificial structures were synthesized by layer by layer pulsed laser deposition. The interlayer coupling between adjacent superconducting CaCuO2 blocks was investigated. The thickness of the BaCuO2+δ charge reservoir (CR) layer was gradually increased up to m=10. It was found that interlayer coupling is not essential for high Tc superconductivity: giant CR blocks, thicker than 20 angstrom, (m ≈ 5), depress only moderately Tc while increase the 2D character of superconductivity. Furthermore hetero-epitaxial (BaCuO2+δ)m/(CaCuO2)2/(BaCuO2+δ)m tri-layers made of a single superconducting block sandwiched between two CR blocks were deposited. Electrical transport measurements showed that such ultra thin structures are superconducting with Tc up to about 60 K and critical current densities (at 4 K) as high as 108 A cm-2. Such finding confirmed the occurrence of purely intralayer superconductivity in these artificial structures.
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C. Aruta, Giusepe Balestrino, S. Lavanga, P. G. Medaglia, P. Orgiani, Antonello Tebano, "Artificial high-temperature superconducting structures", Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); doi: 10.1117/12.453808; https://doi.org/10.1117/12.453808

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