Evidence for Uniform Coexistence of Ferromagnetism and Unconventional Superconductivity in UGe<sub>2</sub>: A<sup>73</sup>Ge-NQR Study under Pressure

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  • Kotegawa H.
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Harada A.
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Kawasaki S.
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Kawasaki Y.
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Kitaoka Y.
    Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University
  • Haga Y.
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Yamamoto E.
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Onuki Y.
    Advanced Science Research Center, Japan Atomic Energy Research Institute Department of Physics, Graduate School of Science, Osaka University
  • Itoh K. M.
    Department of Applied Physics and Physico-Informatics, Keio University
  • Haller E. E.
    Department of Materials Science and Engineering, University of California at Berkeley and Lawrence Berkeley National Laboratory
  • Harima H.
    Department of Physics, Faculty of Science, Kobe University

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  • Evidence for Uniform Coexistence of Ferromagnetism and Unconventional Superconductivity in UGe2: A 73Ge-NQR Study under Pressure

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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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