Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/79605
Type: Artigo de periódico
Title: Strong dependence of superconducting transition temperature (T-c) on the rare earth ionic size in REBaSrCu3O7 (RE = Y, Dy, Nd and La) series
Author: Awana, VPS
Malik, SK
Cardoso, CA
De Lima, OF
Gupta, A
Sedky, A
Yelon, WB
Prasad, R
Narlikar, AV
Abstract: The REBaSrCu3O7 compounds with RE = Y, Dy, Nd and La have been synthesized by the standard solid-state reaction route. Superconducting transition temperatures (T-c), as measured by ac susceptibility technique, are 81 K, 79 K, 62 K and 45 K for samples with RE = Y, Dy, Nd and La, respectively. The rare earth dependence of T-c in the REBaSrCu3O7 series is quite different from that observed in the REBa2Cu3O7 (RE:123) series where T-c is nearly independent of the choice of the RE (except when RE = Ce, Pr and Tb). Neutron diffraction studios have been carried out on the REBaSrCu3O7 compounds and structural details have been obtained from the Rietveld analysis of the room-temperature neutron diffraction data. The compounds with RE = Y, Dy are found to crystallize in the orthorhombic RE:123 structure (space group Pmmm) with orthorhombicity considerably smaller than that of the RE:123 compounds. In fact, the orthorhombicity reduces so much that the REBaSrCu3O7 compounds with light rare earths, RE = La and Nd, are tetragonal or almost tetragonal.
Country: Singapura
Editor: World Scientific Publ Co Pte Ltd
Rights: fechado
Identifier DOI: 10.1142/S0217984900000471
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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