Electrical and magnetic properties of an Ising-type ferromagnet NpSb2

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

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  • Electrical and Magnetic Properties of an Ising-type Ferromagnet NpSb<SUB>2</SUB>

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We succeeded in growing a single crystal of NpSb2 with the SmSb2-type orthorhombic structure by the Sb-flux method and measured the electrical resistivity, specific heat, magnetic susceptibility and magnetization. NpSb2 is found to be an Ising-type ferromagnet with the Curie temperature TC=47 K, where the ordered moment of 1.6 μB/Np is oriented along the [001] direction. The electronic specific heat coefficient is estimated to be 22 mJ/(K2·mol). The electrical resistivity for the current J||[001] is by two orders of magnitude larger than that for J⊥[001], suggesting the quasi-two-dimensional electronic state.

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