Is La<sub>3</sub>Ni a New Unconventional Superconductor?

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  • Sato Noriaki
    Department of Physics, Faculty of Science, Tohoku University, Sendai 980
  • Imamura Kimihiro
    Department of Physics, Faculty of Science, Tohoku University, Sendai 980
  • Sakon Takuo
    Department of Physics, Faculty of Science, Tohoku University, Sendai 980
  • Komatsubara Takemi
    Department of Physics, Faculty of Science, Tohoku University, Sendai 980
  • Umehara Izuru
    Department of Physics, Faculty of Engineering, Yokohama National University, Yokohama 240
  • Sato Kiyoo
    Department of Physics, Faculty of Engineering, Yokohama National University, Yokohama 240

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タイトル別名
  • Is La3Ni a New Unconventional Superconductor?
  • Is La3Ni a New Unconventional Supercond

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説明

We find that La3Ni is a type-II superconductor with a Ginzburg-Landau parameter, κ=49. The temperature dependence of the specific heat reveals two peaks, one of which appears in the superconducting phase and is ascribed to the symmetry change of the superconducting order parameter. We observe nearly T3 power law dependence of the specific heat, implying that the superconducting energy gap function has nodes on points. The lower critical magnetic field Hc1 in the lower temperature phase is larger than that in the higher temperature phase.

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