Quadrupole-quadrupole forces in cerium metal

dc.contributor.author Koenigsberg, Ernest
dc.contributor.department Physics and Astronomy
dc.date 2018-08-22T23:10:03.000
dc.date.accessioned 2020-06-30T07:24:52Z
dc.date.available 2020-06-30T07:24:52Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 1953
dc.date.issued 1953
dc.description.abstract <p>The specific heat of cerium shows an anomalous peak at about 12°K. The peak is too sharp to be accounted for by the splitting of the ground level by the electrostatic field of the crystal. In this thesis an attempt has been made to explain the peak by proposing a model which approximates the metal as a hexagonal close packed array of multipoles superimposed on a uniform negative charge density. This model contains strong quadrupole-quadrupole couplings between the ions of the lattice. The Q-Q energies are of the order of magnitude of the crystal field energies, and the effect of these Q-Q couplings on the filling of the various states is considerable;The simple approach, based on an approximate partition function, approximate wave functions and the assumption that the ions of the various kinds are randomly distributed throughout the lattice, is evidently inadequate to explain the anomaly in the specific heat;An attempt to improve the wave functions shows that the crystal field wave functions are not suitable, but the improved wave functions do not appreciably change the specific heat, (Stated more carefully, wave functions obtained by neglecting Q-Q interactions are not appropriate at very low temperatures.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/rtd/12930/
dc.identifier.articleid 13929
dc.identifier.contextkey 6866555
dc.identifier.doi https://doi.org/10.31274/rtd-180813-14193
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath rtd/12930
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/66353
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/rtd/12930/r_DP11992.pdf|||Fri Jan 14 19:33:38 UTC 2022
dc.subject.disciplines Atomic, Molecular and Optical Physics
dc.subject.keywords Cerium
dc.subject.keywords Specific heat
dc.title Quadrupole-quadrupole forces in cerium metal
dc.type article
dc.type.genre dissertation
dspace.entity.type Publication
relation.isOrgUnitOfPublication 4a05cd4d-8749-4cff-96b1-32eca381d930
thesis.degree.level dissertation
thesis.degree.name Doctor of Philosophy
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