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Magnetic Hyperfine Interactions in Sm¹⁴⁹ in Ferromagnetic SmAl₂


Lesikar, Arnold Vincent (1965) Magnetic Hyperfine Interactions in Sm¹⁴⁹ in Ferromagnetic SmAl₂. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/V6NE-2T09.


The internal field acting at the samarium nucleus in SmAl2 is investigated theoretically and experimentally. The internal field is computed in the molecular field approximation assuming a crystalline electric field to act on the trivalent samarium ion. Admixtures of the first excited multiplet of the ion by the exchange and crystalline electric field are included in the calculation and lead to an increase of no more than 10% in the theoretically predicted internal field from the values predicted when the admixture is neglected if a crystal field interaction of reasonable size is assumed. The internal field resulting from theory is compared with the values resulting from Mossbauer studies of the hyperfine structure of the 22 kev gamma transition in Sm149. The best fit made to the experimentally observed Mossbauer absorption patterns leads to an internal field much smaller than that predicted by theory. Possible sources of this disagreement between theory and experiment are discussed.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Mossbauer, Rudolf L.
Thesis Committee:
  • Unknown, Unknown
Defense Date:25 May 1965
Record Number:CaltechETD:etd-09272002-143609
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3793
Deposited By: Imported from ETD-db
Deposited On:27 Sep 2002
Last Modified:08 Feb 2024 23:52

Thesis Files

PDF (Lesikar_a_1965.pdf) - Final Version
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