University of Illinois Urbana-Champaign

Transitional impurities in liquid copper

Gardner, John Arvy

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https://hdl.handle.net/2142/25044

Description

Title
Transitional impurities in liquid copper
Author(s)
Gardner, John Arvy
Issue Date
1966
Doctoral Committee Chair(s)
Flynn, C.P.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
  • Transitional Impurities
  • Liquid Copper
  • Magnetic Moments
  • Alloys
  • Knight shift
Language
en
Abstract
"We have measured the high temperature susceptibility of dilute solutions of elements belonging to the first transitional series in both liquid and solid copper. We found that the solutes Crt Mn, Fe, and Co possess localized magnetic moments in these alloys. The impurity moments were calculated from the susceptibility and found to change little on melting. The Cu63 Knight shift in liquid copper is found to be decreased by dissolved transition impurities with the maximum decrease of about 20% for each atomic percent of impurity occurring in the Cu-Mn solutions. The change caused by magnetic impurities in the copper Knight shift is found to depend inversely on temperature. We have analyzed the Knight shift results using a single OPW approximation for the conduction electrons and the Friedel virtual bound state""picture for the transition impurities. The resonance shifts predicted by this model are smaller than those found experimentally for magnetic solutes. Best agreement is found when the virtual bound impurity states are described by a density of states band which is confined to an energy range of 1.3 to 2.5 ev' and drops sharply to zero at the edges. The impurity bands for electrons of opposite spin appear to be displaced by order 1 to 2.5 eVa"
Type of Resource
text
Permalink
http://hdl.handle.net/2142/25044
Copyright and License Information
1966 John Arvy Gardner, Jr.

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Graduate Theses and Dissertations at Illinois