Exotic Superconductivity in the Coexistent Phase of Antiferromagnetism and Superconductivity in CeCu<sub>2</sub>(Si<sub>0.98</sub>Ge<sub>0.02</sub>)<sub>2</sub>: A Cu-NQR Study under Hydrostatic Pressure

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  • Kawasaki Yu
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Ishida Kenji
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Kawasaki Shinji
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Mito Takeshi
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Zheng Guo-qing
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Kitaoka Yoshio
    Department of Physical Science, Graduate School of Engineering Science, Osaka University
  • Geibel Christoph
    Max-Planck Institute for Chemical Physics of Solids
  • Steglich Frank
    Max-Planck Institute for Chemical Physics of Solids

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  • Exotic Superconductivity in the Coexistent Phase of Antiferromagnetism and Superconductivity in CeCu2(Si0.98Ge0.02)2: A Cu-NQR Study under Hydrostatic Pressure

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We report a pressure (P) effect on CeCu2(Si0.98Ge0.02)2 where an antiferromagnetic (AFM) order at TN∼0.75 K coexists with superconductivity below Tc∼0.4 K. At pressures exceeding P=0.19 GPa, the AFM order is suppressed, which demonstrates that the sudden emergence of AFM order due to the Ge doping is ascribed to the intrinsic lattice expansion. The exotic superconductivity at P=0 GPa is found to evolve into a typical heavy-fermion one with a line-node gap above P=0.91 GPa. We highlight that the anomalous enhancement in nuclear spin–lattice relaxation rate 1⁄T1 that follows a T1T = const. behavior well below Tc at P=0 GPa is characterized by the persistence of low-lying magnetic excitations, which may be inherent to the coexistent state of antiferromagnetism and superconductivity.

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