Evidence for uniform coexistence of ferromagnetism and unconventional superconductivity in UGe2: A 73Ge-NQR study under pressure

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

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45 Citations (Scopus)


We report on the itinerant ferromagnetic superconductor UGe2 through 73Ge-NQR measurements under pressure (P). The P dependence of the NQR spectrum signals a first-order transition from the low-temperature (T) and low-P ferromagnetic phase (FM2) to high-T and high-P one (FM1) around a critical pressure of Px ∼ 1:2 GPa. The superconductivity exhibiting a maximum value of Tsc = 0:7 K at Px ∼ 1:2 GPa, was found to take place in connection with the P-induced first-order transition. The nuclear spin-lattice relaxation rate 1/T1 has probed the ferromagnetic transition, exhibiting a peak at the Curie temperature as well as a decrease without the coherence peak below Tsc. These results reveal the uniformly coexistent phase of ferromagnetism and unconventional superconductivity with a line-node gap. We remark on an intimate interplay between the onset of superconductivity and the underlying electronic state for the ferromagnetic phases.

Original languageEnglish
Pages (from-to)705-711
Number of pages7
Journaljournal of the physical society of japan
Issue number2
Publication statusPublished - Feb 2005
Externally publishedYes


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

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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