Y-dilution Effects on Magnetic Properties of Anomalous Antiferromagnet TbB<sub>2</sub>C<sub>2</sub>

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  • Haino Masami
    Department of Physics, Graduate School of Science, Tohoku University
  • Tobo Aya
    Department of Physics, Graduate School of Science, Tohoku University
  • Onodera Hideya
    Department of Physics, Graduate School of Science, Tohoku University

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  • Y-dilution Effects on Magnetic Properties of Anomalous Antiferromagnet TbB2C2

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Magnetic susceptibility and specific heat experiments were performed on the single crystalline Tb1−xYxB2C2 (0≤x≤0.5) compounds. The anomalous increase of magnetic susceptibility below TN in TbB2C2 was similarly observed in all the compounds. The Y dilution weakens the domain preference and the in-plane anisotropy in susceptibility disappears for x=0.4 and 0.5. As x increases, the Néel temperature decreases rapidly so as to reach 0 K around x=0.6, and the specific heat anomaly around TN also decreases considerably. These results are well explained by the scheme of a Van Vleck antiferromagnetic transition. The specific heat experiments reveal that the 4f ground state is a singlet with the first excited state of a singlet that locates around 40 K.

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