Local ordering and charge transfer during room-temperature annealing of quenched tetragonal YBa[sub 2]Cu[sub 3]O[sub 6. 25]
Journal Article
·
· Physical Review, B: Condensed Matter; (United States)
- Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
Neutron powder diffraction was used to study the crystallographic structure of a quenched tetragonal sample of YBa[sub 2]Cu[sub 3]O[sub 6.25] during room-temperature annealing. It is found that the lattice parameters decrease with anneal time. The time dependence of the two lattice parameters is characterized by a single relaxation time [similar to]760 min. Similar relaxation times were recently found for the electrical resistances [ital R][sub [ital a][ital b]], [ital R][sub [ital c]], in tetragonal single crystals of YBa[sub 2]Cu[sub 3]O[sub 6.25]. These results are interpreted in terms of local ordering of the oxygen ions in the basal CuO[sub [ital x]] plane, leading to a charge transfer between the CuO[sub [ital x]] and CuO[sub 2] planes. It is the same effect that leads to the rise in [ital T][sub [ital c]] observed earlier in orthorhombic YBa[sub 2]Cu[sub 3]O[sub 6+[ital x]] ([ital x][gt]0.35). The mechanism of the local ordering and the concept of oxygen ions ordering in a structure with tetragonal symmetry are discussed.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 7085510
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 51:1; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON TRANSFER
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
NEUTRON DIFFRACTION
ORDER-DISORDER TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
QUENCHING
SCATTERING
SUPERCONDUCTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
ANNEALING
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON TRANSFER
HEAT TREATMENTS
HIGH-TC SUPERCONDUCTORS
NEUTRON DIFFRACTION
ORDER-DISORDER TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
QUENCHING
SCATTERING
SUPERCONDUCTORS
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES