Magnetic and electrical properties in NpAl4 and UAl4

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  • Aoki Dai
    Institute for Materials Research, Tohoku University
  • Haga Yoshinori
    Advanced Science Research Center, Japan Atomic Energy Agency
  • Homma Yoshiya
    Institute for Materials Research, Tohoku University
  • Shiokawa Yoshinobu
    Institute for Materials Research, Tohoku University 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
  • Settai Rikio
    Graduate School of Science, Osaka University
  • Onuki Yoshichika
    Advanced Science Research Center, Japan Atomic Energy Agency Graduate School of Science, Osaka University

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  • Magnetic and Electrical Properties in NpAl<SUB>4</SUB> and UAl<SUB>4</SUB>

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We grew high-quality single crystals of NpAl4, together with UAl4, by the Al-flux method and measured the electrical resistivity, specific heat, magnetic susceptibility, magnetization and de Haas–van Alphen (dHvA) effect. NpAl4 is an antiferromagnet with the Néel temperature TN=49 K. The corresponding magnetic moment is most likely directed along the [010] direction in the orthorhombic crystal structure. The large magnetic entropy at TN and the Curie–Weiss behavior suggest the localized nature of 5f-electrons with the 5f4 configuration. The detected dHvA frequencies in NpAl4 are small, indicating that the small magnetic Brillouin zone is formed in the antiferromagnetic state. On the other hand, the large Fermi surfaces are observed in a paramagnet UAl4. The detected cyclotron mass is relatively large, ranging from 3.4 to 23m0, which is consistent with the electronic specific heat coefficient γ=89 mJ/(K2·mol).

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