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X-ray absorption studies of YBa sub 2 Cu sub 3 O sub 6+x , La sub 2-x Sr sub x CuO sub 4 , and Nd sub 2-x Ce sub x CuO sub 4

Conference ·
OSTI ID:5363309
; ; ; ; ;  [1]
  1. Brookhaven National Lab., Upton, NY (USA)
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O K-edge absorption studies show that the density of O 2p empty states near the Fermi level increases with increasing oxygen content for YBa{sub 2}Cu{sub 3}O{sub 6+x}, and Sr concentration in La{sub 2-x}Sr{sub x}CuO{sub 4}. With Zn substitution for Cu in YBa{sub 2}Cu{sub 3}O{sub 7}, {Tc} does not correlate with the density of O 2p empty states. In this case Tc dramatically decreases with Zn substitution while the pre-edge feature remains unchanged. The O K-edge spectrum of Nd{sub 2-x}Ce{sub x}CuO{sub 4} barely changes from the undoped, insulating, to the Ce doped superconducting sample. The lack of unoccupied O 2p states near the Fermi level in this case is consistent with naive expectations for electron-doping. 21 refs., 4 figs.
Research Organization:
Brookhaven National Lab., Upton, NY (USA)
Sponsoring Organization:
DOE/ER
DOE Contract Number:
AC02-76CH00016
OSTI ID:
5363309
Report Number(s):
BNL-43461; CONF-891093--15; ON: DE90003640
Country of Publication:
United States
Language:
English

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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
ABSORPTION SPECTRA
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DOPED MATERIALS
ELECTROMAGNETIC RADIATION
ELECTRONIC STRUCTURE
ENERGY LEVELS
FERMI LEVEL
IONIZING RADIATIONS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MATERIALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
RADIATIONS
RARE EARTH COMPOUNDS
SPECTRA
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
X RADIATION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES