Anisotropy of critical correlations in moderately delocalized cerium and actinide systems

Phys. Rev. B 34, 3261 – Published 1 September 1986
Nicholas Kioussis and Bernard R. Cooper

Abstract

The equilibrium and excitation magnetic behavior of a class of cerium and light actinide compounds have been explained previously, in a theory first developed by Siemann and Cooper, in terms of a band-f-electron anisotropic hybridization-mediated two-ion interaction of the Coqblin-Schrieffer type. Using the same theory, we present here a calculation, within the random-phase approximation, of the longitudinal component of the static wave-vector-dependent susceptibility in the paramagnetic phase. The calculations have been performed in the presence of a cubic crystal field (CF) and yield results for the ratio of inverse critical correlation lengths, κ?/κ, parallel and perpendicular to the moment direction, that compare well with those of diffuse critical neutron scattering experiments. In Ce3+ (f1) compounds, we find that as the CF interaction (Γ7 ground state) predominates over the two-ion interaction, the relative strength of the coupling within the ferromagnetic {001} planes (with moments perpendicular to the planes) and that between the {001} planes is gradually reversed, resulting in a ratio κ?/κ smaller than unity, as is experimentally observed. We also present results for the effect of differing intraionic (L-S, intermediate, and j-j) coupling on κ?/κ for the case of Pu3+(f5) and U3+(f3) compounds.

DOI: http://dx.doi.org/10.1103/PhysRevB.34.3261

  • Received 19 November 1985
  • Published in the issue dated 1 September 1986

© 1986 The American Physical Society

Authors & Affiliations

Nicholas Kioussis and Bernard R. Cooper

  • Department of Physics, West Virginia University, Morgantown, West Virginia 26506

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