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

Conference · Thu Jan 25 04:00:00 EST 1990 · AIP Conference Proceedings (American Institute of Physics); (USA)

OSTI ID:6793823

Lin, C L; Qui, S L; Chen, J; Strongin, M ^[1]; Crow, J E ^[2]; Chu, C W ^[3]

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1. Brookhaven National Laboratory Physics Department, Upton, NY (USA)
2. Physics Department, Temple University, Philadelphia, PA (USA)
3. Physics Department, University of Houston, Houston, TX (USA)

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+{ital x}}, and Sr concentration in La{sub 2{minus}{ital x}}Sr{sub {ital x}}CuO{sub 4}. With Zn substitution for Cu in YBa{sub 2}Cu{sub 3}O{sub 7}, T{sub c} does not correlate with the density of O 2p empty states. In this case T{sub c} dramatically decreases with Zn substitution while the pre-edge feature remains unchanged. The O K-edge spectrum of Nd{sub 2{minus}{ital x}}Ce{sub {ital 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.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 6793823
• Report Number(s): CONF-891092--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (USA) Journal Volume: 199:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360200* -- Ceramics
Cermets
& Refractories
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DOPED MATERIALS
ELECTRONIC STRUCTURE
ENERGY LEVELS
FERMI LEVEL
HIGH-TC SUPERCONDUCTORS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
MATERIALS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SPECTROSCOPY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
X-RAY SPECTROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES