Effects of Y dilution on the antiferroquadrupolar ordering in the tetragonal compound DyB2C2

Shuuichi Sako, Hideya Onodera, Hiroki Yamauchi, Kentaro Indoh, Aya Tobo, Kenji Ohoyama, Yasuo Yamaguchi

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Antiferroquadrupolar (AFQ) and magnetic transitions in Dy1-xYxB2C2 (0 ≤ x ≤ 0.6) have been investigated on the single-crystalline samples by magnetization and specific heat measurements. As the Y concentration increases, the magnetic transition temperature decreases from 15.3 K at x = 0 to 4.5 K at x = 0.6. The AFQ transition temperature also decreases from 24.7 K at x = 0 to 7.4 K at x = 0.6, although it becomes unclear for x ≥ 0.5 in the magnetization. A λ-type peak of specific heat at TQ becomes broader as x increases, and changess to a small upheaval for x ≥ 0.5. On the other hand, the field-induced transitions at the boundary between the AFQ and paramagnetic phases are clearly observed in the magnetization processes at 1.5 K x ≤ 0.6. The behavior of specific heat implies that the AFQ interaction acts strongly in a rather shorter distance than the antiferromagnetic interaction in DyB2C2. The Y dilution causes in a wide distribution of the AFQ interaction strength acting on the Dy quadrupoles. Then the AFQ order developes in a wide temperature range, and is almost completed above the magnetic transition temperature.

Original languageEnglish
Pages (from-to)1872-1879
Number of pages8
Journaljournal of the physical society of japan
Volume69
Issue number6
DOIs
Publication statusPublished - 2000 Jun

Keywords

  • Antiferromagnetic order
  • Antiferroquadrupolar order
  • DyBC
  • Magnetic anisotropy
  • Magnetic susceptibility
  • Specific heat
  • Spontaneous magnetization
  • Transition temperature
  • Y dilution

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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