Studies of Y-Ba-Cu-O single crystals by x-ray absorption spectroscopy

Conference · Sat Feb 01 04:00:00 EST 1992

OSTI ID:10153990

Krol, A; Ming, Z H; Kao, Y H ^[1]; Nuecker, N; Roth, G; Fink, J ^[2]; Smith, G C ^[3]; Erband, A; Mueller-Vogt, G ^[4]; Karpinski, J; Kaldis, E ^[5]; Schoenmann, K ^[6]

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1. State Univ. of New York, Buffalo, NY (United States). Dept. of Physics
2. Kernforschungszentrum Karlsruhe GmbH (Germany). Inst. fuer Nukleare Festkoerperphysik
3. Brookhaven National Lab., Upton, NY (United States)
4. Karlsruhe Univ. (T.H.) (Germany). Inst. fuer Kristallchemie
5. Eidgenoessische Technische Hochschule, Zurich (Switzerland). Lab. fuer Festkoerperphysik
6. Walther-Meissner-Institut fuer Tieftemperaturforschung, Garching (Germany)

The symmetry and density of unoccupied states of YBa{sub 2}Cu{sub 3}O{sub 7} YBa{sub 2}Cu{sub 4}O{sub 8} have been investigated by orientation dependent x-ray absorption spectroscopy on the O 1s edge using a bulk-sensitive fluorescence-yield-detection method. It has been found that the O 2p holes are distributed equally between the CuO{sub 2} planes and CuO chains and that the partial density of unoccupied O 2p states in the CuO{sub 2} planes are identical in both systems investigated. The upper Hubbard band has been observed in the planes but not in the chains in both systems. 18 refs.

• Research Organization: Brookhaven National Lab., Upton, NY (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 10153990
• Report Number(s): BNL--47236; CONF-9109102--7; ON: DE92014687
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202
664200
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTROSCOPY
BARIUM OXIDES
COPPER OXIDES
EXCITED STATES
HIGH-TC SUPERCONDUCTORS
SPECTRA OF ATOMS AND MOLECULES AND THEIR INTERACTIONS WITH PHOTONS
STRUCTURE AND PHASE STUDIES
X-RAY SPECTRA
X-RAY SPECTROSCOPY
YTTRIUM OXIDES