Evidence for the Coexistence of Superconductivity and the Magnetic<i>A</i>-Phase in CeCu<sub>2</sub>Si<sub>2</sub>Proved by Muon Knight Shift

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  • Koda Akihiro
    Meson Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801
  • Higemoto Wataru
    Meson Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801
  • Kadono Ryosuke
    Meson Science Laboratory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1 Oho, Tsukuba, Ibaraki 305-0801
  • Kawasaki Yu
    Graduate school of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531
  • Ishida Kenji
    Graduate school of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531
  • Kitaoka Yoshio
    Graduate school of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531
  • Geibel Christoph
    Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
  • Steglich Frank
    Max-Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany

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  • Evidence for the Coexistence of Superconductivity and the Magnetic A-Phase in CeCu2Si2 Proved by Muon Knight Shift.

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Muon spin rotation measurements under high transverse fields (HTF-μSR) have been performed on polycrystalline samples of Ce0.99Cu2.02Si2. The muon hyperfine coupling constant was determined to be -3.36 kOe/μB from a Knight shift (K) vs susceptibility (χ) plot for 2 K < T < 200 K, which is comparable to those for Cu and Si nuclei. Below ∼1 K, the Knight shift at the precession signal, showing broadening due to the magnetic A-phase, exhibited a reduction at 0.5 T, while it remained unchanged above 1.0 T, strongly suggesting the microscopic coexistence of superconductivity with the magnetic A-phase.

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