First observation of quantum oscillations in the ferromagnetic superconductor UCoGe

Dai Aoki, Ilya Sheikin, Tatsuma D. Matsuda, Valentin Taufour, Georg Knebel, Jacques Flouquet

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33 Citations (Scopus)


We succeeded in growing high quality single crystals of the ferromagnetic superconductor UCoGe and measured the magnetoresistance at fields up to 34T. The Shubnikov-de Haas signal was observed for the first time in a U-111 system (UTGe, UTSi, T: transition metal). A small pocket Fermi surface (F ∼ 1 kT) with large cyclotron effective mass 25 m0 was detected at high fields above 22 T, implying that UCoGe is a low carrier system accompanyed with heavy quasi-particles. The observed frequency decreases with increasing fields, indicating that the volume of detected Fermi surface changes nonlinearly with field. The cyclotron mass also decreases, which is consistent with the decrease of the A coefficient of resistivity.

Original languageEnglish
Article number013705
JournalJournal of the Physical Society of Japan
Issue number1
Publication statusPublished - 2011 Jan


  • Effective mass
  • Fermi surface
  • Ferromagnetism
  • Quantum criticality
  • Shubnikov-de haas effect
  • UCoGe
  • Unconventional superconductivity
  • Upper critical field


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