Structural properties of high-T/sub c/ oxide superconductors. [YBa/sub 2/Cu/sub 3/O/sub 7-x/ and La/sub 2-x/M/sub x/CuO/sub 4-y/ (M = Ba, Sr, Ca)]

Conference · Sat Aug 01 00:00:00 EDT 1987

OSTI ID:5681079

Jorgensen, J D

Structural studies have played a key role in understanding the new oxide superconductors. Neutron powder diffraction techniques have been of particular importance because of the difficulty in synthesizing single crystals of the desired quality and compositions and because of the need to accurately determine the locations and site occupancies of the oxygen atoms. The electronic properties have been shown to depend in a critical way on the structural details of the Cu-O sublattices in these compounds. The La/sub 2-x/M/sub x/CuO/sub 4-y/ (M = Ba, Sr, Ca,...) structure contains a two-dimensional square planar Cu-O sublattice with weak bonding between the layers. The YBa/sub 2/Cu/sub 3/O/sub 7-x/ structure contains both two-dimensional and one-dimensional Cu-O sublattices, commonly referred to as ''planes'' and ''chains.'' Closely-related non-superconducting phases which exhibit small differences in stoichiometry or symmetry have also been studied and have provided key insights into the close relationship between structure and superconductivity in these systems. 88 refs., 6 figs.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5681079
• Report Number(s): CONF-870873-19; ON: DE88002974
• Resource Relation: Conference: 18. conference on low temperature physics, Kyoto, Japan, 20 Aug 1987; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
ELECTRONIC STRUCTURE
LATTICE PARAMETERS
COPPER OXIDES
LANTHANUM OXIDES
STRONTIUM OXIDES
SUPERCONDUCTORS
YTTRIUM OXIDES
ANTIFERROMAGNETISM
CRYSTAL LATTICES
NEUTRON DIFFRACTION
PHASE TRANSFORMATIONS
REVIEWS
STOICHIOMETRY
VACANCIES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DIFFRACTION
DOCUMENT TYPES
LANTHANUM COMPOUNDS
MAGNETISM
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
RARE EARTH COMPOUNDS
SCATTERING
STRONTIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
656100 - Condensed Matter Physics- Superconductivity