Ferromagnetism and Superconductivity in CaRuO3/YBa2Cu3O7-δ Heterostructures |
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| Authors: | Alina Marinela Ionescu,Ion Ivan,Claudiu Locovei,Melania Onea,Adrian Crisan,Soltan Soltan,Gisela Schü tz,Joachim Albrecht |
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| Affiliation: | 1.National Institute of Materials Physics, Atomistilor 405A, 077125 Magurele, Romania; (I.I.); (C.L.); (M.O.); (A.C.);2.Faculty of Physics, University of Bucharest, Atomistilor Street 405, 077125 Magurele, Romania;3.Department of Physics, Faculty of Science, Helwan University, Cairo 11792, Egypt;4.Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, D-70569 Stuttgart, Germany;5.Research Institute for Innovative Surfaces FINO, Aalen University, Beethovenstr. 1, D-73430 Aalen, Germany; |
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| Abstract: | The deposition of a ferromagnetic layer can affect the properties of high-temperature superconductors underneath. We investigated the influence of ferromagnetic CaRuO3 on the properties of YBa2Cu3O7-x (YBCO) superconducting thin films when the layers are either in direct contact or separated by a barrier layer of 5 nm SrTiO3. Detailed measurements of the magnetic moment of the superconductor and ferromagnet as a function of temperature and magnetic field have been performed using SQUID magnetometry. Magnetometry and relaxation measurements show that the modification of the superconducting properties of YBCO strongly depends on the interaction with the ferromagnetic layer on top. The barrier layer has a significant impact on both the supercon-ducting properties of the YBCO film and the ferromagnetic ordering of CaRuO3. The physical properties mentioned above were discussed in correlation with the materials’ structure determined by XRD analysis. |
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| Keywords: | superconductor-ferromagnetic heterostructures critical temperature SQUID magnetometry |
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