Superconductivity of the Y1-xLaxBa2Cu3Oy system prepared in air
Creators
- 1. Bordeaux-1 Univ., 33 - Talence (France)
- 2. ISMRA, 14 - Caen (France)
- 3. CRTBT-CNRS, 38 - Grenoble (France)
Description
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 880OC for 24 h and annealing at 500OC for 48 h) in order to fix the oxygen partial pressure. YBa2Cu3Oy and LaBa2Cu3Oy have an orthorhombic and a tetragonal symmetry respectively. An orthorombic to tetragonal transformation has been found for x>O.75. All the compounds having the orthorombic 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 LaBa2Cu3Oy. However this last compound prepared under pure oxygen atmosphere has been found to be superconducting (Tcr = 70K). 11 refs
Additional details
Publishing Information
- Journal Title
- J. Phys. (Les Ulis)
- Journal Volume
- 48
- Journal Issue
- 10
- Series
- J. Phys. (Les Ulis).
- Journal Page Range
- 1619-1622
- ISSN
- 0302-0738
- CODEN
- JOPQA
INIS
- Country of Publication
- France
- Country of Input or Organization
- France
- INIS RN
- 19031405
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- BARIUM OXIDES; COPPER OXIDES; CRYSTAL STRUCTURE; LANTHANUM OXIDES; MAGNETIC SUSCEPTIBILITY; OXYGEN; STOICHIOMETRY; SUPERCONDUCTIVITY; X-RAY DIFFRACTION; YTTRIUM OXIDES
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; COPPER COMPOUNDS; DIFFRACTION; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ELEMENTS; LANTHANUM COMPOUNDS; MAGNETIC PROPERTIES; NONMETALS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SCATTERING; TRANSITION ELEMENT COMPOUNDS; YTTRIUM COMPOUNDS