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 04:00:00 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), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 50:13; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

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