Relationship between planar-copper--apical-oxygen bond length and charge transfer in YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} superconductors

Journal Article · Thu Jun 01 00:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.51.15617· OSTI ID:54964

Gupta, R P ^[1]; Gupta, M ^[2]

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1. Centre d`Etudes de Saclay, Departement d`Etudes du Comportement des Materiaux, Section de Recherches de Metallurgie Physique, 91191 Gif sur Yvette Cedex (France)
2. Institut des Sciences des Materiaux, Universite de Paris-Sud, Batiment. 415 91405 Orsay (France)

The variation of the hole density and hence the superconducting transition temperature {ital T}{sub {ital c}} has been widely correlated with a variation in the planar-copper--apical-oxygen bond length. A decrease in this bond is usually taken to reflect an increase in the hole density in the CuO{sub 2} planes. Results of electronic-structure calculations are presented that show that a decrease in the planar-copper--apical-oxygen bond does enhance the hole density in the CuO{sub 2} planes in the YBa{sub 2}Cu{sub 3}O{sub 7} superconductor. However, this enhancement is relatively small. A major fraction of the hole density in this compound can thus be attributed to the oxygen atoms in the chains.

• OSTI ID: 54964
• Journal Information: Physical Review, B: Condensed Matter, Vol. 51, Issue 21; Other Information: PBD: 1 Jun 1995
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
HIGH-TC SUPERCONDUCTORS
BOND LENGTHS
COPPER OXIDES
BARIUM OXIDES
YTTRIUM OXIDES
CARRIER DENSITY
ELECTRON TRANSFER
TRANSITION TEMPERATURE
ELECTRONIC STRUCTURE