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

E. Hassinger, D. Aoki, G. Knebel, J. Flouquet

Research output: Contribution to journalConference articlepeer-review

14 Citations (Scopus)

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.

Original languageEnglish
Article number012055
JournalJournal of Physics: Conference Series
Volume200
Issue numberSECTION 1
DOIs
Publication statusPublished - 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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