High-field Fermi surface properties in the low-carrier heavy-fermion compound URu 2Si 2

Dai Aoki, Georg Knebel, Ilya Sheikin, Elena Hassinger, Liam Malone, Tatsuma D. Matsuda, Jacques Flouquet

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22 Scopus citations


We performed the Shubnikov-de Haas (SdH) experiments of the low-carrier heavy-fermion compound URu 2Si 2 at high fields up to 34 T and at low temperatures down to 30 mK. All main SdH branches named α, β, and γ were observed for all the measured field-directions (H k ||001] → ||100], ||100] → ||110] and ||001] → ||110]), indicating that they are attributed to the closed Fermi surfaces with nearly spherical shapes. An anomalous split of branch α was detected for the field along the basal plane; the split immediately disappeared by tilting the field to [001] direction, implying a fingerprint of the hidden order state. High-field experiments reveal the complicated field-dependence of the SdH frequencies and the cyclotron masses due to the Zeeman spin-splitting associated with the Fermi surface reconstruction in the hidden order state with small carrier numbers. A new SdH branch named ω with a large cyclotron mass of 25m 0 was detected at high fields above 23 T close to hidden order instabilities.

Original languageEnglish
Article number074715
JournalJournal of the Physical Society of Japan
Issue number7
StatePublished - Jul 2012
Externally publishedYes


  • Cyclotron effective mass
  • De Haas-van Alphen effect
  • Fermi surface
  • Hidden order
  • Shubnikov-de Haas effect
  • Spin split
  • URu Si


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