Author

Hsun Lee

Publication Date

1988

Document Type

Dissertation/Thesis

First Advisor

Kimball, Clyde W.

Degree Name

M.S. (Master of Science)

Department

Department of Physics

LCSH

Superconductors||Superconductivity||Mössbauer spectroscopy

Abstract

⁵⁷Fe Mossbauer effect measurements have been performed at room temperature on Y(Ba₁-ₓSrₓ)₂(Cu₀.₉₉Fe₀.₀₁)₃O[sub y] with x from 0 to 1. In all samples, four quadrupole splittings, corresponding to iron atoms in different local sites, are observed. The Mossbauer spectra for low Sr concentrations resemble those for 1% Fe doping in the high temperature orthorhombic oxide, YBa₂(Cu₀.₉₉Feo.01₀.₀₁)₃O₇ The experimental neutron diffraction results show that iron atoms substitute principally into the Cul site or an interstitial site near Cul in YBa₂ (Cu₁-ₓFeₓ)₃O₇. The strontium ion is smaller than the barium ion so that a lattice distortion, or defects, may occur and additional oxygen vacancies may be introduced. This would lead to the depression of T[sub c] in the Y(Ba₁-ₓSrₓ)₂(Cu₀.₉₉Fe₀.₀₁)₃O[sub y] series.

Comments

Bibliography: pages [39]-41.

Extent

vii, 41 pages

Language

eng

Publisher

Northern Illinois University

Rights Statement

In Copyright

Rights Statement 2

NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.

Media Type

Text

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