Dense Kondo Effect in Caged Compound CeRu

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概要

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• We prepared single crystals of the caged compound CeRu<inf>2</inf>Zn<inf>20</inf>by the flux method, and measured the magnetization, magnetic susceptibility, specific heat, and electrical resistivity. The lattice constant measured at room temperature suggests that the Ce ion is trivalent in this compound. The temperature dependence of magnetic susceptibility obeys the Curie--Weiss law with the effective Bohr magneton of Ce³⁺at high temperatures. However, at low temperatures, CeRu<inf>2</inf>Zn<inf>20</inf>indicates no phase transition down to 2 K and shows typical behaviors of a heavy Fermion system; the enhanced magnetic susceptibility \chi_{0}, the enhanced electronic specific-heat coefficient \gamma_{0}, and the electrical resistivity with the temperature dependence of AT^{2}, although these parameters somewhat depend on samples. The Wilson ratio R_{\text{W}} of \chi_{0}/\gamma_{0} is approximately 2, which does not depend on samples. A/\gamma_{0} is plotted on the line of N = 2 in the new Kadowaki--Woods plots. The Kondo temperature T_{\text{K}} is roughly estimated from the present experiments; it ranges from 25 to 38 K depending on samples. These characteristics are typical of dense Kondo compounds.

• 2013-08-15

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

• Kumagai Keigou

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

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