Cation stoichiometric La2CaCu2O6+y: An undoped oxide superconducting at 45K
Creators
- 1. C.S.I.C., Barcelona (Spain)
- 2. Institut Laue-Langevin, Grenoble (France)
Description
Preparation of single-phase stoichiometric La2CaCu2O6+y from oxide precursors is reported along with high resolution neutron powder diffraction studies. An air-heated sample having y = 0.037(8) displays a transition onset at 45K to diamagnetic susceptibility. Neutron diffraction data show a high atomic ordering of La and Ca ions with strong preference (75%) of Ca ions for sites 8-fold coordinated located between the CuO2 planes. The other 25% is occupied by La ions, around which presumably the excess oxygen is located. Comparison of this structure with that of non-superconducting oxide La1.9Ca1.1Cu2O6+y, suggests that the observed small superconductivity fraction is related to superconducting islands in which the oxygen excess is clustered along with the La ions
Additional details
Publishing Information
- Publisher
- American Ceramic Society, Inc.
- Imprint Place
- Westerville, OH (USA)
- Imprint Title
- The Second International Ceramic Science and Technology Congress and the American Ceramic Society's Electronics Division Meeting
- Imprint Pagination
- 131 p.
- Journal Page Range
- p. 93.
Conference
- Title
- 2. international ceramic science and technology congress.
- Dates
- 12-15 Nov 1990.
- Place
- Orlando, FL (USA).
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 22076258
- Subject category
- S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE; S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Conference
- Descriptors DEI
- CALCIUM OXIDES; COPPER OXIDES; DATA PROCESSING; HIGH-TC SUPERCONDUCTORS; LANTHANUM OXIDES; LATTICE PARAMETERS; MAGNETIC SUSCEPTIBILITY; MEASURING METHODS; NEUTRON DIFFRACTION; STOICHIOMETRY
- Descriptors DEC
- ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COHERENT SCATTERING; COPPER COMPOUNDS; DIFFRACTION; LANTHANUM COMPOUNDS; MAGNETIC PROPERTIES; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; SCATTERING; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS
Optional Information
- Secondary number(s)
- CONF-901125--.