Magnetism in the heavy-electron superconductors UPt3 and URu2Si2

M. R. Norman, T. Oguchi, Arthur J Freeman

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

The nature of magnetism in the heavy-electron superconductors UPt3 and URu2Si2 is investigated by using a spin-orbit generalized variant of local-spin-density (LSD) theory to calculate the self-consistent moment-polarized electronic structure and the dynamic (bare-band) susceptibility. It is shown that the direction of the magnetic moment is predicted correctly. The size of the moment, however, is 0.8B in UPt3 and 1.2B in URu2Si2, i.e., a factor of 40 larger than experiment. It is noted, however, that the experimental moment of (0.650.1)B for Th- or Pd-doped UPt3 is close to the theoretical value. The static susceptibility, (q), is predicted to be weakly dependent on q except for UPt3, where a peak is found at q=(/c)(0,0,2)in general agreement with neutron-scattering data at high frequencies. The low-frequency anomalies in the neutron data which lead to magnetic ordering are not seen in the calculated dynamic susceptibility, but can be understood in terms of a moment-moment interaction. An explanation for these conflicting data is offered based on the interaction of itinerant quasiparticle and local-moment degrees of freedom at low temperatures, which leads to a renormalization of the LSD spin-spin response function.

Original languageEnglish
Pages (from-to)11193-11198
Number of pages6
JournalPhysical Review B
Volume38
Issue number16
DOIs
Publication statusPublished - 1988

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Magnetism
Superconducting materials
moments
Electrons
Neutron scattering
Magnetic moments
Electronic structure
Magnetization
Neutrons
Orbits
electrons
magnetic permeability
Experiments
Temperature
neutron scattering
degrees of freedom
magnetic moments
interactions
anomalies
electronic structure

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Magnetism in the heavy-electron superconductors UPt3 and URu2Si2. / Norman, M. R.; Oguchi, T.; Freeman, Arthur J.

In: Physical Review B, Vol. 38, No. 16, 1988, p. 11193-11198.

Research output: Contribution to journalArticle

Norman, M. R. ; Oguchi, T. ; Freeman, Arthur J. / Magnetism in the heavy-electron superconductors UPt3 and URu2Si2. In: Physical Review B. 1988 ; Vol. 38, No. 16. pp. 11193-11198.
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