O 2 p holes: Temperature effects and surface characteristics of cuprate superconductors
- Department of Chemical Engineering Department of Materials Science, University of Minnesota, Minneapolis, Minnesota 55455 (USA)
- Argonne National Laboratory, Argonne, Illinois 60439 (USA)
The O 2{ital p} holes in the Cu- and Bi-based oxide superconductors La-Sr-Cu-O, Y-Ba-Cu-O, Bi-Sr-Ca-Cu-O, Tl-Ba-Ca-Cu-O, and Ba-K-Bi-O, and in CuO have been investigated with inverse photoelectron spectroscopy. These states exhibit a unique resonance for incident electron energies near the O 2{ital s} shallow core in the Cu-based superconductors but it is not observed in CuO or in Ba-K-Bi-O. Variations in the resonance show that the number of O 2{ital p} holes (1) increases at 60 K compared to 300 K, (2) is significantly reduced in oxygen-deficient samples, (3) is altered but not quenched upon Pr substitution for Y, (4) is reduced by electron bombardment at {similar to}1500 eV, and (5) is quenched by Cu- or Au-adatom-induced surface disruption. The Bi-Sr-Ca-Cu-O surfaces are found to be the most stable against high-energy electron bombardment and interface formation.
- OSTI ID:
- 6861141
- Journal Information:
- Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 41:7; ISSN 0163-1829; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY LEVELS
HOLES
IONIZING RADIATIONS
LANTHANUM COMPOUNDS
LANTHANUM OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
P STATES
PHOTOELECTRON SPECTROSCOPY
POLYCRYSTALS
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
RADIATIONS
RARE EARTH COMPOUNDS
RESONANCE
SPECTROSCOPY
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
SURFACE PROPERTIES
TEMPERATURE DEPENDENCE
THALLIUM COMPOUNDS
THALLIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
ULTRAHIGH VACUUM
ULTRAVIOLET RADIATION
VERY LOW TEMPERATURE
X RADIATION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES