Rare earth impurities in metals: The transition from virtual to bound f levels
Blodgett, Jerry Alan
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https://hdl.handle.net/2142/25749
Description
Title
Rare earth impurities in metals: The transition from virtual to bound f levels
Author(s)
Blodgett, Jerry Alan
Issue Date
1968
Doctoral Committee Chair(s)
Flynn, C.P.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
rare earth impurities in metals
bound f levels
Knight shift
bulk magnetic susceptibility
Language
en
Abstract
Measurements of the solvent Knight shift and bulk magnetic
susceptibility have been carried out in dilute alloys of the rare earth
metals in liquid Cu. Other measurements of the Al and Cu Knight shift
in dilute alloys of Gd in Al-Cu and Al-Ag binary alloys have also
been made.
The susceptibility measurements of the rare earths in liquid
Cu indicate localized magnetic moments on the rare earth impurities
except La and Lu. These have the same magnitudes as the moments
observed for free rare earth atoms and are attributed to the spinorbit
coupling of the rare earth 4f electrons.
The solvent Knight shift measurements in liquid Gu show
little variation throughout the rare earth series which indicates that
valance scattering is the dominant effect. In contrast to the results
found in pure Al, any influence of the 4f cores on the scattering
process is quite small.
The Al and Cu Knight shift changes in Al-Cu-Gd and Al-Ag-Gd
alloys show a most interesting behavior as the binary composition is
varled from pure Al to pure Cu or Ag. At a temperature of 1100 C,
r = 1/K dK/dc is found to remain relatively constant at a value of ~ 12
from pure Al to ~ 60 at.% CU or Ag. At this point, r drops sharply to
a value near 0 for both the Al and Cu resonance and remains relatively
constant at this level to pure Cu or Ag composition. This has been
interpreted as a transition of 4f core electrons from virtual bound
levels in pure Al to bound states below the conduction band bottom in
pure Cu and Ag.
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