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

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

Research output: Contribution to journalArticle

44 Citations (Scopus)

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 - Feb 2005
Externally publishedYes

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ferromagnetism
superconductivity
critical pressure
spin-lattice relaxation
nuclear spin
Curie temperature
electronics

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Evidence for uniform coexistence of ferromagnetism and unconventional superconductivity in UGe2 : A 73Ge-NQR study under pressure. / Kotegawa, H.; Harada, A.; Kawasaki, Shinji; Kawasaki, Y.; Kitaoka, Y.; Haga, Y.; Yamamoto, E.; Onuki, Y.; Itoh, K. M.; Haller, E. E.; Harima, H.

In: Journal of the Physical Society of Japan, Vol. 74, No. 2, 02.2005, p. 705-711.

Research output: Contribution to journalArticle

Kotegawa, H, Harada, A, Kawasaki, S, Kawasaki, Y, Kitaoka, Y, Haga, Y, Yamamoto, E, Onuki, Y, Itoh, KM, Haller, EE & 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, vol. 74, no. 2, pp. 705-711. https://doi.org/10.1143/JPSJ.74.705
Kotegawa, H. ; Harada, A. ; Kawasaki, Shinji ; Kawasaki, Y. ; Kitaoka, Y. ; Haga, Y. ; Yamamoto, E. ; Onuki, Y. ; Itoh, K. M. ; Haller, E. E. ; Harima, H. / Evidence for uniform coexistence of ferromagnetism and unconventional superconductivity in UGe2 : A 73Ge-NQR study under pressure. In: Journal of the Physical Society of Japan. 2005 ; Vol. 74, No. 2. pp. 705-711.
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AB - 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.

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