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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Abstract

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
Volume74
Issue number2
DOIs
Publication statusPublished - 2005 Feb 1

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Kotegawa, H., Harada, A., Kawasaki, S., Kawasaki, Y., Kitaoka, Y., Haga, Y., Yamamoto, E., Onuki, Y., Itoh, K. M., Haller, E. E., & Harima, H. (2005). Evidence for uniform coexistence of ferromagnetism and unconventional superconductivity in UGe2: A 73Ge-NQR study under pressure. Journal of the Physical Society of Japan, 74(2), 705-711. https://doi.org/10.1143/JPSJ.74.705