Artificial high-temperature superconducting structures

C. Aruta; Giusepe Balestrino; S. Lavanga; P. G. Medaglia; P. Orgiani; Antonello Tebano

doi:10.1117/12.453808

7 November 2002 Artificial high-temperature superconducting structures

C. Aruta, Giusepe Balestrino, S. Lavanga, P. G. Medaglia, P. Orgiani, Antonello Tebano

Proceedings Volume 4811, Superconducting and Related Oxides: Physics and Nanoengineering V; (2002) https://doi.org/10.1117/12.453808
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

(BaCuO_2+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 BaCuO_2+δ charge reservoir (CR) layer was gradually increased up to m=10. It was found that interlayer coupling is not essential for high T_c superconductivity: giant CR blocks, thicker than 20 angstrom, (m ≈ 5), depress only moderately T_c while increase the 2D character of superconductivity. Furthermore hetero-epitaxial (BaCuO_2+δ)_m/(CaCuO₂)₂/(BaCuO_2+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 T_c 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.

Citation Download Citation

C. Aruta, Giusepe Balestrino, S. Lavanga, P. G. Medaglia, P. Orgiani, and Antonello Tebano "Artificial high-temperature superconducting structures", Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); https://doi.org/10.1117/12.453808

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