Possible Antiferro-Octupolar Order in Antiferromagnetic TbB<SUB>2</SUB>C<SUB>2</SUB> Examined by Gd Substitution

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  • Matsuoka Eiichi
    Department of Physics, Graduate School of Science, Tohoku University
  • Sasaki Yuta
    Department of Physics, Graduate School of Science, Tohoku University
  • Usui Daichi
    Department of Physics, Graduate School of Science, Tohoku University
  • Nakagawa Masaaki
    Department of Physics, Graduate School of Science, Tohoku University
  • Onodera Hideya
    Department of Physics, Graduate School of Science, Tohoku University

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  • Possible Antiferro-Octupolar Order in Antiferromagnetic TbB2C2 Examined by Gd Substitution

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Abstract

We have examined the effects of Gd substitution on the anomalous antiferromagnetic (AFM) properties of TbB2C2 having field-induced antiferro-quadrupolar (AFQ) ordered phases. The Gd substitution induces drastic changes in the magnetic properties. The AFM structure characteristic to TbB2C2, the anomalous increase in magnetic susceptibility below TN, and the strong preference of AFM domains disappear with the substitution of low Gd content of less than 10%. We propose a promising assumption that an antiferro-octupolar (AFO) ordering occurs at TN simultaneously with AFM ordering in TbB2C2. The fragility of anomalous properties originates in the fragility of the antiferro-octupolar interaction against the substitution of Gd3+ ions with L=0.

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