Fermi-surface selective determination of the g -factor anisotropy in URu2Si2

Gaël Bastien, Dai Aoki, Gérard Lapertot, Jean Pascal Brison, Jacques Flouquet, Georg Knebel

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4 Citations (Scopus)

Abstract

The g-factor anisotropy of the heavy quasiparticles in the hidden order state of URu2Si2 has been determined from the superconducting upper critical field and microscopically from Shubnikov-de Haas (SdH) oscillations. We present a detailed analysis of the g factor for the α, β, and γ Fermi-surface pockets. Our results suggest a strong g-factor anisotropy between the c axis and the basal plane for all observed Fermi-surface pockets. The observed anisotropy of the g factor from the quantum oscillations is in good agreement with the anisotropy of the superconducting upper critical field at low temperatures, which is strongly limited by the paramagnetic pair breaking along the easy magnetization axis c. However, the anisotropy of the initial slope of the upper critical field near Tc cannot be explained by the anisotropy of the effective masses and Fermi velocities derived from quantum oscillations.

Original languageEnglish
Article number165138
JournalPhysical Review B
Volume99
Issue number16
DOIs
Publication statusPublished - 2019 Apr 24

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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