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Ca 3d unoccupied states in Bi2Sr2CaCu2O8 investigated by Ca L2,3 x-ray-absorption near-edge structure

Abstract

The high-resolution Ca L(2,3) x-ray-absorption near-edge-structure (XANES) spectrum of a Bi2Sr2CaCu2O8 single crystal has been measured by use of a magnetic-projection x-ray microscope probing a surface area of 200x200 micrometers square. The Ca L(2,3) XANES spectrum is analyzed by performing a multiple-scattering XANES calculation in real space and comparing the results with the spectrum of CaF2. Good agreement between the calculated and experimental crystal-field splitting Delta f of the Ca 3d final states is found and the splitting is shown to be smaller by 0.5 eV than in the initial state. The Ca 3d partial density of states is found to be close to the Fermi level in the initial state. The Ca-O (in plane) distance is shown to be a critical parameter associated with the shift of the Ca 3d states relative to the Fermi level; in particular, the authors have studied the effect of the out-of-plane dimpling mode of the in-plane oxygen atoms O(in plane) that will move the Ca 3d states on or off the Fermi level. This mode can therefore play a role in modulating the charge transfer between the two CuO2 planes separated by the Ca ions.
Publication Date:
Jan 01, 1992
Product Type:
Technical Report
Report Number:
PB-93-201473/XAB; STF-19-A92029
Reference Number:
GRA-93-82335; EDB-93-114156
Subject:
36 MATERIALS SCIENCE; CALCIUM; D STATES; HIGH-TC SUPERCONDUCTORS; X-RAY SPECTROSCOPY; OXIDES; CRYSTAL STRUCTURE; ABSORPTION; BISMUTH OXIDES; CALCIUM OXIDES; CRYSTAL FIELD; CUPRATES; FERMI LEVEL; INTERMETALLIC COMPOUNDS; MULTIPLE SCATTERING; STRONTIUM OXIDES; ALKALINE EARTH METAL COMPOUNDS; ALKALINE EARTH METALS; ALLOYS; BISMUTH COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; COPPER COMPOUNDS; ELEMENTS; ENERGY LEVELS; METALS; OXYGEN COMPOUNDS; SCATTERING; SORPTION; SPECTROSCOPY; STRONTIUM COMPOUNDS; SUPERCONDUCTORS; TRANSITION ELEMENT COMPOUNDS; 360202* - Ceramics, Cermets, & Refractories- Structure & Phase Studies
OSTI ID:
6470051
Research Organizations:
Selskapet for Industriell og Teknisk Forskning, Trondheim (Norway). Div. of Applied Physics
Country of Origin:
Norway
Language:
English
Availability:
NTIS
Submitting Site:
GRA
Size:
Pages: (11 p)
Announcement Date:
May 13, 2001

Citation Formats

Borg, A, King, P L, Pianetta, P, Lindau, I, and Mitzi, D B. Ca 3d unoccupied states in Bi2Sr2CaCu2O8 investigated by Ca L2,3 x-ray-absorption near-edge structure. Norway: N. p., 1992. Web.
Borg, A, King, P L, Pianetta, P, Lindau, I, & Mitzi, D B. Ca 3d unoccupied states in Bi2Sr2CaCu2O8 investigated by Ca L2,3 x-ray-absorption near-edge structure. Norway.
Borg, A, King, P L, Pianetta, P, Lindau, I, and Mitzi, D B. 1992. "Ca 3d unoccupied states in Bi2Sr2CaCu2O8 investigated by Ca L2,3 x-ray-absorption near-edge structure." Norway.
@misc{etde_6470051,
title = {Ca 3d unoccupied states in Bi2Sr2CaCu2O8 investigated by Ca L2,3 x-ray-absorption near-edge structure}
author = {Borg, A, King, P L, Pianetta, P, Lindau, I, and Mitzi, D B}
abstractNote = {The high-resolution Ca L(2,3) x-ray-absorption near-edge-structure (XANES) spectrum of a Bi2Sr2CaCu2O8 single crystal has been measured by use of a magnetic-projection x-ray microscope probing a surface area of 200x200 micrometers square. The Ca L(2,3) XANES spectrum is analyzed by performing a multiple-scattering XANES calculation in real space and comparing the results with the spectrum of CaF2. Good agreement between the calculated and experimental crystal-field splitting Delta f of the Ca 3d final states is found and the splitting is shown to be smaller by 0.5 eV than in the initial state. The Ca 3d partial density of states is found to be close to the Fermi level in the initial state. The Ca-O (in plane) distance is shown to be a critical parameter associated with the shift of the Ca 3d states relative to the Fermi level; in particular, the authors have studied the effect of the out-of-plane dimpling mode of the in-plane oxygen atoms O(in plane) that will move the Ca 3d states on or off the Fermi level. This mode can therefore play a role in modulating the charge transfer between the two CuO2 planes separated by the Ca ions.}
place = {Norway}
year = {1992}
month = {Jan}
}