Single Crystal Growth of Large-Size and High-Quality NpCoGa<sub>5</sub>and Its Electrical and Magnetic Properties

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  • Aoki Dai
    Institute for Materials Research, Tohoku University
  • Homma Yoshiya
    Institute for Materials Research, Tohoku University
  • Shiokawa Yoshinobu
    Institute for Materials Research, Tohoku University Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Yamamoto Etsuji
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Nakamura Akio
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Haga Yoshinori
    Advanced Science Research Center, Japan Atomic Energy Research Institute
  • Settai Rikio
    Graduate School of Science, Osaka University
  • Takeuchi Tetsuya
    Low Temperature Center, Osaka University
  • Onuki Yoshichika
    Advanced Science Research Center, Japan Atomic Energy Research Institute Graduate School of Science, Osaka University

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  • Single Crystal Growth of Large-Size and High-Quality NpCoGa5 and Its Electrical and Magnetic Properties

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We succeeded in growing a high-quality NpCoGa5 single crystal by the Ga-flux method and measured its electrical resistivity, specific heat, magnetic susceptibility and magnetization. NpCoGa5 is an antiferromagnet with a Néel temperature of 47 K. The magnetic moment of Np is directed along the [001] direction of a tetragonal crystal structure. A sharp metamagnetic transition was observed at Hm=43 kOe for H||[001], where the antiferromagnetic state is changed to the paramagnetic state above Hm. The ordered moment was determined to be 0.74μB⁄Np. The magnetic properties were discussed on the basis of the crystalline electric field scheme of the 5f4 configuration.

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