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Field-Induced Uniform Antiferromagnetic Order Associated with Superconductivity in Pr_<1-x>LaCe_xCuO_<4-δ>

  • KADONO Ryosuke
    Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
  • OHISHI Kazuki
    Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
  • KODA Akihiro
    Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
  • SAHA Shanta R.
    Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK)
  • HIGEMOTO Wataru
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • FUJITA Masaki
    Institute for Materials Research, Tohoku University
  • YAMADA Kazuyoshi
    Institute for Materials Research, Tohoku University

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  • Field Induced Uniform Antiferromagnetic Order Associated with Superconductivity in Pr1 xLaCexCuO4 デルタ

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Abstract

A strong correlation between field-induced antiferromagnetic (AF) order and superconductivity is demonstrated for an electron-doped cuprate superconductor, Pr_<1-x>LaCe_xCuO_<4-δ>(PLCCO). In addition to the specimen with x=0.11 (which is close to the AF phase boundary, x≃0.10), we show that the specimen with x=0.15 (T_c≃16 K at zero field) also exhibits the field-induced AF order with a reduced magnitude of the induced moment. The uniform muon Knight shift at a low magnetic field (〜10^2 Oe) indicates that the AF order is not localized within the cores of flux lines, which is in marked contrast to theoretical predictions for hole-doped cuprates. The presence of anomalous nondiagonal hyperfine coupling between muons and Pr ions is also demonstrated in detail.

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