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|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|
De Lima O.F.
|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 studies 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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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