Unconventional superconductivity in the itinerant ferromagnet UGe2:73Ge-NQR study under pressure

A. Harada, S. Kawasaki, H. Mukuda, Y. Kitaoka, Y. Haga, E. Yamamoto, Y. Onuki, K. M. Itoh, E. E. Haller, H. Harima

Research output: Contribution to journalArticlepeer-review


The superconducting characteristics on the itinerant ferromagnetic superconductor UGe2 have been investigated via the 73Ge-NQR measurements under pressure (P) near the critical pressure Px where the first-order transition takes place from the low-temperature (T) and low-P ferromagnetic phase (FM2) to high-T and high-P one (FM1). The measurements of nuclear spin-lattice relaxation rate 1 / T1 have revealed a power-law like behavior as Tn without the coherence peak, whereas at low temperatures, it deviates from the Tn dependence to a T-linear like behavior. These results that depend on the pressure are well understood in terms of non-unitary spin-triplet pairing state where the ferromagnetic up-spin band is gapped, but the down-spin band remains gapless at the Fermi level. We will argue an intimate relationship of the onset of SC with FM1 and FM2.

Original languageEnglish
Pages (from-to)963-964
Number of pages2
JournalPhysica B: Condensed Matter
Issue numberSPEC. ISS.
Publication statusPublished - 2006 May 1


  • First-order phase transition
  • Itinerant ferromagnetism
  • NQR under pressure
  • Nonunitary state
  • UGe
  • Unconventional superconductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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