Electron spectroscopy studies of high temperature superconductors: Y/sub 1/minus/x/Pr/sub x/Ba/sub 2/Cu/sub 3/O/sub 7/minus/delta/
Conference
·
OSTI ID:6757713
We itemize our previous work on high T/sub c/ superconductors, and describe more fully the results of an electron spectroscopy study and impurity Anderson Hamiltonian analysis of the Pr 4f spectrum of Y/sub 1/minus/x/Pr/sub x/Ba/sub 2/Cu/sub 3/O/sub 7/minus/delta/, a system in which superconductivity is quenched as x increases. It has been speculated that Pr has valence 4+, resulting in extra charge in the Cu-O planes, and causing T/sub c/-suppression. We find that the Pr valence is close to 3+ for all x but that there is extensive Pr 4f hybridization with other valence band states. The Cu valence is essentially unchanged with x. From these findings, we speculate that Pr 4f hybridization with other valence band states has enabled Pr spin fluctuations to cause the T/sub c/-suppression. 41 refs., 4 figs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 6757713
- Report Number(s):
- LA-UR-89-258; CONF-8810255-2; ON: DE89006554
- Country of Publication:
- United States
- Language:
- English
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Thu Dec 31 23:00:00 EST 1987
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OSTI ID:6842974
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Journal Article
·
Sat Jul 01 00:00:00 EDT 1995
· Physical Review, B: Condensed Matter
·
OSTI ID:76412
Superconductivity and magnetism in the system Y{sub 1{minus}x}Pr{sub x}Ba{sub 1.5}Sr{sub 0.5}Cu{sub 3}O{sub 7{minus}{delta}} (0{le}x{le}1.0)
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Mon Mar 31 23:00:00 EST 1997
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Related Subjects
36 MATERIALS SCIENCE
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
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
EMISSION
HAMILTONIANS
HYBRIDIZATION
MATHEMATICAL OPERATORS
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
QUANTUM OPERATORS
RARE EARTH COMPOUNDS
SECONDARY EMISSION
SPECTRA
SPECTROSCOPY
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
VALENCE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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
COPPER COMPOUNDS
COPPER OXIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
EMISSION
HAMILTONIANS
HYBRIDIZATION
MATHEMATICAL OPERATORS
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
PHYSICAL PROPERTIES
PRASEODYMIUM COMPOUNDS
PRASEODYMIUM OXIDES
QUANTUM OPERATORS
RARE EARTH COMPOUNDS
SECONDARY EMISSION
SPECTRA
SPECTROSCOPY
SUPERCONDUCTIVITY
TRANSITION ELEMENT COMPOUNDS
VALENCE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES