Yuehai Liang

Publication Date

1991

Document Type

Dissertation/Thesis

First Advisor

Kimball, Clyde W.

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Physics

LCSH

Rare earth metal compounds; Superconductors--Chemistry

Abstract

Mossbauer studies on ⁵⁷Fe-doped REBa₂Cu₃O₇_δ (RE=Er,Dy) were conducted with Fe concentration at 0.15 and 0.30. The results show that the magnetic behavior of the ⁵⁷Fe dopants, which mainly occupy Cu(l) sites, changes dramatically as the magnitude of the rare earth moment varies. The dimensionality of the magnetic interaction changes from 2D to 3D when the rare earth substitute changes from Er to Dy. The line-widths of the Mossbauer subspectra characterize the fluctuation behavior of the magnetic phase transition in the vicinity of T[sub N]. The magnitude of the rare earth moments appears to play a dominant role in the magnetic interaction of Fe dopants in these compounds.

Comments

Includes bibliographical references (pages [61]-63)

Extent

vii, 63 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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