Degree Type

Dissertation

Date of Award

1992

Degree Name

Doctor of Philosophy

Department

Physics and Astronomy

First Advisor

Constantine Stassis

Abstract

Neutron diffraction techniques have been used to study the electronic structure of La[subscript]2NiO[subscript]4 and Sr[subscript]2CuO[subscript]2Cl[subscript]2 by measuring the antiferromagnetic form factor of the single-crystal samples at 15 K. The antiferromagnetic form factor was obtained from the integrated intensities of several magnetic reflections. In both cases, the experimentally determined form factor exhibits a plateau at low Q values (up to 3 A[superscript]-1), similar to that observed for La[subscript]2CuO[subscript]4. Detailed modelling of the experimental data of these three compounds suggests that the observed plateau may be accounted for by including the covalency effects in the Ni-O or Cu-O plane. The experimental data are also compared with spin-polarized band calculations.

DOI

https://doi.org/10.31274/rtd-180813-11319

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Xun-Li Wang

Language

en

Proquest ID

AAI9223978

File Format

application/pdf

File Size

159 pages

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