High-temperature superconductors: Occupied and unoccupied electronic states

Conference · Thu Feb 25 04:00:00 EST 1988 · AIP Conf. Proc.; (United States)

OSTI ID:6957292

Meyer, III, H M; Gao, Y; Wagener, T J; Hill, D M; Weaver, J H; Flandermeyer, B K; Capone, II, D W

The energy distributions of the occupied and unoccupied electronic states of the high temperature superconductors La/sub 1.85/Sr/sub 0.15/CuO/sub 4/ and YBa/sub 2/Cu/sub 3/O/sub 6.9/ have been identified using x-ray photoemission, high resolution synchrotron radiation photoemission, inverse photoemission, high resolution synchrotron radiation photoemission, inverse photemission and bremsstrahlung isochromat spectroscopy. These results show low state density from approx.0.5 eV below to approx.3.5 eV above the Fermi energy, E/sub F/, well-defined Cu-O occupied levels extending to approx.7 eV, the occupied core levels, and the empty Ba, Y, and La states above E/sub F/. Copper is shown to be in a nominally 2+ valence state. Comparisons are made with band structure calculations.

• Research Organization: Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, MN 55455
• OSTI ID: 6957292
• Report Number(s): CONF-871178-
• Conference Information: Journal Name: AIP Conf. Proc.; (United States) Journal Volume: 165:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BINDING ENERGY
BREMSSTRAHLUNG
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ELECTROMAGNETIC RADIATION
EMISSION
ENERGY
ENERGY LEVELS
ENERGY-LEVEL DENSITY
FERMI LEVEL
IONIZING RADIATIONS
LANTHANUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHOTOEMISSION
RADIATIONS
RARE EARTH COMPOUNDS
RESOLUTION
SECONDARY EMISSION
STRONTIUM COMPOUNDS
SYNCHROTRON RADIATION
TRANSITION ELEMENT COMPOUNDS
X RADIATION
YTTRIUM COMPOUNDS