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Insufficiency of O and Cu holes for oxide superconductivity: X-ray absorption spectroscopy

Journal Article · · Phys. Rev. B: Condens. Matter; (United States)
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We have studied the electronic properties of YBa/sub 2/Cu/sub 3/O/sub 7/ and EuBa/sub 2/Cu/sub 3/O/sub 7/ superconductors with soft x-ray absorption spectroscopy (XAS) at BESSY. Electronic transitions to unoccupied states (holes) of 2p and 3d character on O and Cu, respectively, are found in superconducting specimens. In samples with reduced oxygen content, superconductivity is suppressed, and a decrease in the intensity of transitions to these unoccupied states is observed. However, there is little change in these features when Zn sufficient to suppress supercondicutivity is substituted for Cu. We conclude that O 2p and Cu 3d holes are necessary but not sufficient for superconductivity.

Research Organization:
Physics Department, Hunter College of City University of New York, 695 Park Avenue, New York, New York 10021
OSTI ID:
7090987
Journal Information:
Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 38:10; ISSN PRBMD
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COHERENT SCATTERING
COPPER COMPOUNDS
COPPER OXIDES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
EUROPIUM COMPOUNDS
EUROPIUM OXIDES
HOLES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE EARTH COMPOUNDS
SCATTERING
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
TRANSITION TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES