Antiferroquadrupolar Ordering and Magnetic Properties of the Tetragonal DyB<sub><b>2</b></sub>C<sub><b>2</b></sub>Compound

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  • Yamauchi Hiroki
    Institute for Materials Research, Tohoku University, Sendai 980–8577
  • Onodera Hideya
    Institute for Materials Research, Tohoku University, Sendai 980–8577
  • Ohoyama Kenji
    Institute for Materials Research, Tohoku University, Sendai 980–8577
  • Onimaru Takahiro
    Institute for Materials Research, Tohoku University, Sendai 980–8577
  • Kosaka Masashi
    Institute for Materials Research, Tohoku University, Sendai 980–8577
  • Ohashi Masayoshi
    Institute for Materials Research, Tohoku University, Sendai 980–8577
  • Yamaguchi Yasuo
    Institute for Materials Research, Tohoku University, Sendai 980–8577

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  • Antiferroquadrupolar Ordering and Magnetic Properties of the Tetragonal DyB2C2 Compound.

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Magnetic properties were investigated on a single-crystalline DyB2C2 compound with the tetragonal structure. Spontaneous magnetizations appear along the a- and [1 1 0]-directions below TC=15.3 K. A very small shoulder is observed only along the c-axis at TQ=24.7 K, although large λ-type anomalous specific heats are observed at TC and TQ. There exists a large magnetic anisotropy in the tetragonal basal plane which is observed in magnetization processes below TC. Neutron powder diffraction experiments reveal that magnetic reflections are observed only below TC. In the magnetically ordered phase, the Dy moments are arranged to be perpendicular to neighbors along the c-axis. The results are well interpreted by postulating that the phase between TC and TQ is an antiferroquadrupolar ordered one. DyB2C2 is a novel compound with a high antiferroquadrupolar ordering temperature of 24.7 K.

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