Linearly polarized Cu L sub 3 -edge x-ray-absorption near-edge structure of Bi sub 2 CaSr sub 2 Cu sub 2 O sub 8

Journal Article · Fri Nov 01 04:00:00 EST 1991 · Physical Review, B: Condensed Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.44.10126· OSTI ID:6189503

Bianconi, A; Della Longa, S ^[1]; Li, C; Pompa, M; Congiu-Castellano, A; Udron, D ^[2]; Flank, A M; Lagarde, P ^[3]

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1. University of L'Aquila, via San Sisto 20, 67100 L'Aquila (Italy)
2. Dipartimento di Fisica, Universita degli Studi di Roma La Sapienza,'' I-00185 Roma (Italy)
3. Laboratoire pour l'Utilisation du Rayonnement Electromagnetique (LURE) Batiment 209 D, Universite Paris Sud, 91405 Orsay (France)

The linearly polarized Cu {ital L}{sub 3}-edge x-ray-absorption near-edge structure (XANES) of Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}} has been measured and the spectra are interpreted by the full multiple-scattering approach in real space. The polarized spectra over a range of 20 eV can be predicted in terms of the one-electron dipole ({Delta}{ital l}=+1) transition Cu 2{ital p}{r arrow}{epsilon}{ital d}, probing the unoccupied {ital d}-like ({ital l}=2) density of states projected on the Cu site with orbital angular momentum {ital m}{sub {ital l}}=0, 1 in the {bold E}( ){ital z} spectra, and the {ital m}{sub {ital l}}=2, 1, and 0 in the {bold E}{perpendicular}{ital c} spectra. The oscillator strength for the dipole allowed transitions ({Delta}{ital l}={minus}1) Cu 2{ital p}{r arrow}{var epsilon}{ital s} is shown to be a factor of 100 weaker than the 2{ital p}{r arrow}3{ital d} transitions. The Coulomb interaction in the final state between the Cu 2{ital p} core hole and the excited Cu 3{ital d} electron is found to be 5.5 eV forming a bound state below the continuum threshold, the well-known Cu {ital L}{sub 3} white line. On the contrary, the core hole induces a nearly rigid redshift about 1 eV of the high-energy conduction bands.

• OSTI ID: 6189503
• Journal Information: Physical Review, B: Condensed Matter; (United States), Journal Name: Physical Review, B: Condensed Matter; (United States) Vol. 44:18; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
ENERGY-LEVEL DENSITY
HIGH-TC SUPERCONDUCTORS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
SPECTRA
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
X-RAY SPECTRA