Ferromagnetic superconducting thin films: physics and technological aspects

Hanns-Ulrich Habermeier; G. Cristiani

doi:10.1117/12.455509

7 November 2002 Ferromagnetic superconducting thin films: physics and technological aspects

Hanns-Ulrich Habermeier, G. Cristiani

Proceedings Volume 4811, Superconducting and Related Oxides: Physics and Nanoengineering V; (2002) https://doi.org/10.1117/12.455509
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

The physical properties of the perovskite-type oxide RuSr₂GdCu₂O₈ have been recently discussed in the view of a simultaneous occurrence of superconductivity and ferromagnetism. In order to explore some peculiarities of these compounds we have prepared superlattices of oxides that are known to be either ferromagnetic [La_.67Ca_.33MnO₃ ] or superconducting [YBa₂Cu₃O₇]. Superlattices of different periodicity serve as model systems for the understanding of the features of the RuSr₂GdCu₂O₈ system and are used to compare their properties with those of single phase epitaxially grown RuSr₂GdCu₂O₈ thin films. The YBCO/LCMO superlattices have been grown by pulsed laser deposition with individual layer thickness ranging from 4 to 200 unit cells for the YBa₂Cu₃O₇ and 10 to 500 unit cells for the La_.67Ca_.33MnO₃ . Measuring dc-transport and magnetic properties some novel effects have been found due to a coupling between the layers observed in the superlattices. Superlattices with individual thickness of the constituent materials of 4 nm e.g. show a reduced Curie temperature of 120K and a superconducting transition temperature of 52K. Lowering the temperature a reentrant normal state occurs at T = 25K. Switching off the electronic interlayer coupling by the introduction of insulating SrTiO₃ spacer layers leads to the intrinsic critical temperatures. For the explanation of the results several novel concepts have to be developed based on a long range ferromagnetic interlayer coupling and a novel long range superconducting proximity effect.

Citation Download Citation

Hanns-Ulrich Habermeier and G. Cristiani "Ferromagnetic superconducting thin films: physics and technological aspects", Proc. SPIE 4811, Superconducting and Related Oxides: Physics and Nanoengineering V, (7 November 2002); https://doi.org/10.1117/12.455509

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