Pressure-phase diagram of UCoGe by ac-susceptibility and resistivity measurements

Research output: Contribution to journalConference articleContributedpeer-review

Contributors

  • E. Hassinger - , French Alternative Energies and Atomic Energy Commission (CEA) (Author)
  • D. Aoki - , French Alternative Energies and Atomic Energy Commission (CEA) (Author)
  • G. Knebel - , French Alternative Energies and Atomic Energy Commission (CEA) (Author)
  • J. Flouquet - , French Alternative Energies and Atomic Energy Commission (CEA) (Author)

Abstract

UCoGe is one of the few compounds showing the coexistence of ferromagnetism and superconductivity at ambient pressure. With TCurie = 3K and TSC = 0.6 K it is near a quantum phase transition; the pressure needed to suppress the magnetism is slightly higher than 1 GPa. We report simultaneous resistivity and ac-susceptibility measurements under pressure on a polycrystal with very large single-crystalline domains and a resistivity ratio of about 6. Both methods confirm the phase diagram established before by resistivity measurements on a polycrystal. The ferromagnetic phase is suppressed for P ≈ 1.2 GPa. Astonishingly, the superconductivity persists at pressures up to at least 2.4 GPa. In other superconducting and ferromagnetic heavy fermion compounds like UGe2 and URhGe, the superconducting state is situated only inside the larger ferromagnetic region. Therefore, UCoGe seems to be the first example where superconductivity extends from the ferromagnetic to the paramagnetic region.

Details

Original languageEnglish
Article number012055
JournalJournal of Physics: Conference Series
Volume200
Issue numberSECTION 1
Publication statusPublished - 2010
Peer-reviewedYes
Externally publishedYes

Keywords

ASJC Scopus subject areas