Isotropic \Gamma_{6} Ground State in Caged Cubic Compound NdRu

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概要

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• The magnetic susceptibility \chi, magnetization M, and specific heat C were measured for the caged cubic compound NdRu<inf>2</inf>Zn<inf>20</inf>at temperatures down to 0.5 K in magnetic fields H along the three principal crystallographic axes, [100], [110], and [111]. A ferromagnetic phase transition was observed at the Curie temperature T_{\text{C}}=1.9 K in the temperature dependences of both \chi(T) and C(T). Below T_{\text{C}}, the magnetization curves M(H) show very weak magnetic anisotropy, and the C(T) curves in the fields along the three principal axes show no magnetic anisotropy both below and above T_{\text{C}}. The easy direction of magnetization at 0.5 K changes from the [111] direction at 0 T to the [110] direction at 7 T. We analyzed these characteristic behaviors theoretically by taking into account the crystalline-electric-field energy, the magnetic exchange interaction, and the Zeeman energy. It was found that these features originate from the isotropic \Gamma_{6} ground state mixing with the magnetic \Gamma_{8}^{(1)} excited state. The temperature and magnetic field dependences of M(T,H) and C(T,H) are quantitatively in good agreement with this theoretical calculation.

• 2013-12-15

著者

• Isikawa Yosikazu

  Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan

• Kuwai Tomohiko

  Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan

• Mizushima Toshio

  Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan

• Ejiri Jun-ichi

  Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan

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