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Superconductivity in Bi2Sr2(Sr,Ca)CuOi multilayers obtained by molecular beam epitaxy

TitleSuperconductivity in Bi2Sr2(Sr,Ca)CuOi multilayers obtained by molecular beam epitaxy
Publication TypeArticolo su Rivista peer-reviewed
Year of Publication1999
AuthorsSalvato, M., Attanasio G., Carbone G., Di Luccio Tiziana, Prischepa S.L., Russo R., and Maritato L.
JournalIEEE Transactions on Applied Superconductivity
Volume9
Pagination2006-2009
ISSN10518223
KeywordsBismuth compounds, Calcium compounds, Deposition, High temperature superconductors, Insulating layer, Interfaces (materials), Layered structure, Molecular beam epitaxy, Multilayers, Reflection high energy electron diffraction, Stoichiometry, Strontium compounds, Surface roughness, Temperature, Two dimensional growth mode
Abstract

Bi-based high temperature superconduting multilayers have been obtained by Molecular Beam Epitaxy (MBE) using a deposition method which consists of both co-deposition and growth interruption techniques. We have studied two kinds of structures in which a layer of BizSrzCuOg+s (2201) is alternately stacked by an insulating layer of CaCuOi or SrCuOi in order to obtain 2201/CaCuO2 or IWl/SrCuO?. multilayers. Reflection High Energy Electron Diffraction (RHEED), used to control the quality of the interfaces and the two-dimensional growth mode, gives evidence of an increase in the surface roughness increasing the number of periods. The layered structure has been confirmed comparing experimental and simulated Xray spectra. The R vs. T curves of the 22Ql/SrCuC>2 multilayers present an onset and behave differently from those of the single phase samples with the same stoichiometry but they are not superconducting down to T = 4.2K. On the contrary, the 22Ql/CaCuC>2 samples are superconducting with critical temperatures strongly depending on the CaCuOz thickness. © 1999 IEEE.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0032646297&doi=10.1109%2f77.784857&partnerID=40&md5=4824bf932efbdba921509cbeb4acb3b1
DOI10.1109/77.784857
Citation KeySalvato19992006