Competition of Magnetic Order and Superconductivity in (La1-xBax)2CuO4 Systems

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  • Kitaoka Yoshio
    Department of Material Physics, Faculty of Engineering, Science, Osaka University
  • Hiramatsu Shigeru
    Department of Material Physics, Faculty of Engineering, Science, Osaka University
  • Ishida Kenji
    Department of Material Physics, Faculty of Engineering, Science, Osaka University
  • Kohara Takao
    College of Liberal Arts, Kobe University
  • Asayama Kunisuke
    Department of Material Physics, Faculty of Engineering, Science, Osaka University

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タイトル別名
  • Competition of Magnetic Order and Superconductivity in (La<SUB>1−<I>x</I></SUB>Ba<I><SUB>x</SUB></I>)<SUB>2</SUB>CuO<SUB>4</SUB> Systems
  • Competition of Magnetic Order and Super
  • Competition of Magnetic Order and Superconductivity in (La<sub>1-<i>x</i></sub>Ba<sub><i>x</i></sub>)<sub>2</sub>CuO<sub>4</sub> Systems

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Both the magnetic and superconducting properties of (La1−xBax)2CuO4 systems have been investigated in terms of 139La nuclear quadrupole resonance (NQR). For La2CuO4, it has clearly been demonstrated that the internal field Hn is applied on the La site by magnetic ordering below ∼240 K. The observed Hn is not consistently explained by the spin structure proposed in the neutron diffraction study. For the doped compound with x=0.01, the internal field at 1.3 K was almost the same as that for La2CuO4, while for x=0.025, it decreased and was significantly distributed. Furthermore, the superconductivity was found to set in around 2 K. From a microscopic point of view, it is concluded that the magnetic ordering and superconductivity compete around x=0.025.

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