Order and disorder in the ensemble of Cu-O chain fragments in oxygen-deficient planes of YBa[sub 2]Cu[sub 3]O[sub 6+[ital x]]

Journal Article · Sat Oct 01 00:00:00 EDT 1994 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.50.9531· OSTI ID:6669456

Uimin, G ^[1]

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1. Institut fuer Theoretische Physik der Universitaet zu Koeln, Zuelpicher Strasse 77, D-50937 Koeln 41 (Germany) Landau Institute for Theoretical Physics, Chernogolovka, Moscow District 142432 (Russian Federation)

In connection with numerous x-ray- and neutron-diffraction investigations of some high-temperature superconductors (YBa[sub 2]Cu[sub 3]O[sub 6+[ital x]] and related compounds), a nontrivial part of the structure factor, coming from partly disordered Cu-O-...-O-Cu chain fragments situated within the CuO[sub [ital x]] basal planes, can be a subject of theoretical interest. Closely connected to such a diffusive part of the structure factor are the correlation lengths, which are also available in x-ray- and neutron-diffraction studies and which depend on the degree of oxygen disorder in a basal plane. The quantitative measure of such disorder can be associated with the temperature of a sample anneal [ital T][sub [ital q]] at which the oxygen in the basal plane remains frozen in a high-temperature equilibrium state after a fast quench of the sample to room or lower temperature. The theoretical approach, giving some analytical predictions, is based on numerical calculations. The main goal is to show how the structure factor changes with oxygen content [ital x]. Also illustrated are some other physical quantities, i.e., the concentration of holes leaving CuO[sub [ital x]] planes, the concentration of differently coordinated copper atoms, the number of paramagnetically active Cu-O-... chain fragments, etc. The theoretical approach employed in the paper has been developed for the orthorhombic state of YBa[sub 2]Cu[sub 3]O[sub 6+[ital x]] (YBCO).

• OSTI ID: 6669456
• Journal Information: Physical Review, B: Condensed Matter; (United States), Vol. 50:13; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM OXIDES
ORDER-DISORDER TRANSFORMATIONS
CUPRATES
STOICHIOMETRY
HIGH-TC SUPERCONDUCTORS
YTTRIUM OXIDES
ANNEALING
ANTIFERROMAGNETISM
CARRIER DENSITY
COORDINATION NUMBER
CRYSTAL STRUCTURE
HOLES
ORDER PARAMETERS
ORTHORHOMBIC LATTICES
STRUCTURE FACTORS
SUPERCONDUCTIVITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL LATTICES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
HEAT TREATMENTS
MAGNETISM
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360207* - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)