Characteristic High-Field Magnetization in a Transuranium Antiferromagnet NpRhGa<sub>5</sub>

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  • Sugiyama Kiyohiro
    Graduate School of Science, Osaka University Research Center for Materials Science at Extreme Conditions, Osaka University
  • Nakashima Hiroshi
    Graduate School of Science, Osaka University
  • Aoki Dai
    Institute for Materials Resarch, Tohoku University
  • Haga Yoshinori
    Advanced Science Research Center, Japan Atomic Energy Agency
  • Yamamoto Etsuji
    Advanced Science Research Center, Japan Atomic Energy Agency
  • Nakamura Akio
    Advanced Science Research Center, Japan Atomic Energy Agency
  • Homma Yoshiya
    Institute for Materials Resarch, Tohoku University
  • Shiokawa Yoshinobu
    Institute for Materials Resarch, Tohoku University
  • Kindo Koichi
    Institute for Solid State Physics, University of Tokyo
  • Hagiwara Masayuki
    Research Center for Materials Science at Extreme Conditions, Osaka University
  • Onuki Yoshichika
    Graduate School of Science, Osaka University Advanced Science Research Center, Japan Atomic Energy Agency

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  • Characteristic High-Field Magnetization in a Transuranium Antiferromagnet NpRhGa5

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We have measured the high-field magnetization for a transuranium antiferromagnet NpRhGa5 with two successive antiferromagnetic transition temperatures of TN1=36 and TN2=32 K and an ordered moment of 0.96 μB/Np. For the magnetic field along the easy-axis of the [100] direction of the tetragonal structure, the magnetization indicates a metamagnetic transition at Hc=26 T with a sharp step and saturates above Hs=38 T, with 0.43 μB/Np. On the other hand, the hard-axis magnetization for H||[001] increases linearly and saturates above Hs=28 T, with 0.44 μB/Np. These magnetization curves were discussed on the basis of reorientation and reduction of the magnetic moment.

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