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Article Dans Une Revue Journal de Physique Année : 1987

Superconductivity of the Y1-xLaxBa2Cu 8Oy system prepared in air

Résumé

The Y1-xLaxBa2Cu3Oy oxides have been investigated in order to know the influence of Y-La substitution and oxygen stoichiometry on both crystal structure and superconducting properties. The samples have been prepared in air (heating at 880°C for 24 h and annealing at 500°C for 48 h) in order to fix the oxygen partial pressure. YBa 2Cu3Oy and LaBa2Cu3O y have an orthorhombic and a tetragonal symmetry respectively. An orthorhombic to tetragonal transformation has been found for x > 0.75. All the compounds having the orthorhombic symmetry are superconductors with critical temperature decreasing from 88 K to 46 K as x increases in the composition range 0 ≤x≤0.75. Those with the tetragonal symmetry do not exhibit a superconducting transition as for example LaBa2 Cu3Oy. However this last compound prepared under pure oxygen atmosphere has been found to be superconducting (Tcr = 70K).
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Dates et versions

jpa-00210599 , version 1 (04-02-2008)

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Bernard Chevalier, B. Buffat, Gérard Demazeau, B. Lloret, Jean Etourneau, et al.. Superconductivity of the Y1-xLaxBa2Cu 8Oy system prepared in air. Journal de Physique, 1987, 48 (10), pp.1619-1622. ⟨10.1051/jphys:0198700480100161900⟩. ⟨jpa-00210599⟩
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