Interpocket Polarization Model for Magnetic Structures in Rare-Earth Hexaborides

Yoshio Kuramoto, Katsunori Kubo

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The origin of peculiar magnetic structures in cubic rare-earth (R) hexaborides RB6 is traced back to their characteristic band structure. The three nearly spherical Fermi surfaces induce interpocket polarization of the conduction band as a part of a RKKY-type interaction. It is shown for the free-electron-like model that the interpocket polarization gives rise to a broad maximum in the intersite interaction I(q) around q = (1/4, 1/4, 1/2) in the Brillouin zone. This maximum is consistent with the superstructure observed in R = Ce, Gd and Dy. The wave-number dependence of I(q) is independently extracted by the analysis of the spin-wave spectrum measured for NdB6. It is found that I(q) obtained by fitting the data is similar to that derived by the interpocket polarization model, except that the absolute maximum now occurs at (0, 0, 1/2) consistent with the A-type structure. The overall shape of I(q) gives a hint to understanding the incommensurate structure in PrB6 as well.

Original languageEnglish
Pages (from-to)2633-2636
Number of pages4
Journaljournal of the physical society of japan
Volume71
Issue number11
DOIs
Publication statusPublished - 2002 Nov

Keywords

  • CeB
  • Elastic constant
  • GdB
  • Hexaboddes
  • NdB
  • PrB
  • Quadrupolar interaction
  • RKKY interaction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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