Local singlet for CuO and Nd sub 2 CuO sub 4

Journal Article · Thu Nov 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.8707· OSTI ID:6193647

Gunnarsson, O; Jepsen, O ^[1]; Shen, Z ^[2]

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1. Max-Planck Institut fuer Festkoerperforschung, D-7000 Stuttgart 80 (West Germany)
2. Stanford Electronics Laboratory, Stanford University, Stanford, CA (USA)

Photoemission 3{ital d} spectra according to the Anderson impurity model and experiment are compared for CuO and Nd{sub 2}CuO{sub 4}. While good agreement between theory and experiment is obtained for CuO, the calculated local singlet has much more weight than observed for Nd{sub 2}CuO{sub 4}. This suggests an appreciable difference between the low-energy excitations in CuO and Nd{sub 2}CuO{sub 4}, which is surprising due to the similarities of the compounds, both having formally divalent Cu coordinated to four oxygen atoms in an approximate square. This difference is not predicted by the impurity Anderson model.

• OSTI ID: 6193647
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Vol. 42:13; ISSN 0163-1829; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
CHALCOGENIDES
COLLECTIVE EXCITATIONS
COPPER COMPOUNDS
COPPER OXIDES
COULOMB FIELD
ELECTRIC FIELDS
ELECTROMAGNETIC RADIATION
ELECTRON SPECTROSCOPY
ELECTRONIC STRUCTURE
ENERGY-LEVEL TRANSITIONS
EXCITATION
HIGH-TC SUPERCONDUCTORS
IMPURITIES
IONIZING RADIATIONS
NEODYMIUM COMPOUNDS
NEODYMIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
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RARE EARTH COMPOUNDS
SPECTROSCOPY
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
X RADIATION