Unifying Chemical and Physical Principles for Oxide Superconductivity Based on an Anionic Charge Order Model

Journal Article · Tue May 01 00:00:00 EDT 2001 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1006/jssc.2001.9084· OSTI ID:785143

Oesterreicher, H

Subperoxidic O{sub 2}{sup 3-} charge ordering presents a satisfying basis for a quantitative, conceptually realistic, and unifying understanding of cuprate superconductors. The activity of O{sup -} manifests itself in a variety of ways including a universal T{sub c} scaling with O{sup -} per total O, or more generally, in the subperoxide radical concentration. Also, a characteristic crystal chemistry of O{sup -} placement is indicated. As an example, trends to preferential O{sup -} occupation of the apical sites are correlated with c axis and T{sub c} decreases providing a new crystallographic interpretation of the overdoping question. Generally, subperoxides can be created on overoxidation or through various modes of self doping through lattice pressure-related factors. Accordingly, the role of peranion formation is seen as a most general chemical principle for ameliorating stacking mismatch through electronic liquefaction under internal stress . Cases are discussed (e.g., YBa{sub 2}Cu{sub 3}O{sub 6.5}) where the tension on cooling can result in stratified self-doping steps. A variety of experiments indicating charge order properties, such as stripes and slow charge propagation, are interpreted on the anionic model. Subperoxidic pair formation and charge ordering energetics are discussed. Concepts are further generalized for other cases (e.g., carbides or nitrides) of anionic metallicity and superconductivity. Common aspects are mobile, paired charge orders of radicals coupled through bond polarizations.

• Research Organization: Department of Chemistry and Biochemistry, University of California at San Diego, La Jolla, California (US)
• Sponsoring Organization: None (US)
• OSTI ID: 785143
• Journal Information: Journal of Solid State Chemistry, Vol. 158, Issue 2; Other Information: PBD: 1 May 2001; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBIDES
CUPRATES
NITRIDES
OXIDES
RADICALS
SUPERCONDUCTIVITY
HIGH-TC SUPERCONDUCTORS
ELECTRONIC STRUCTURE
TRANSITION TEMPERATURE
YTTRIUM OXIDES
BARIUM OXIDES
COPPER OXIDES
CRYSTAL MODELS
OXYGEN IONS
ANIONS
SCALING LAWS
CRYSTAL DOPING
DOPED MATERIALS
DENSITY
ION DENSITY
POSITIONING
TEMPERATURE DEPENDENCE
CHARGE CARRIERS
CHEMICAL BONDS
EXPERIMENTAL DATA