Magnetic phase diagrams of Y-diluted antiferromagnet Tb1-xY xB2C2 (0.2 ≤ x ≤ 0.5)

Masami Haino, Aya Tobo, Eiichi Matsuoka, Kenji Ohoyama, Hideya Onodera

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Abstract

Magnetic B-T phase diagrams were examined by magnetization and specific heat experiments on the single crystalline Tb1-xYxB 2C2 (0:2 ≤ x ≤ 0:5) compounds, and neutron diffraction experiments was performed on the powder Tb0.5Y 0.5 11B2C2 sample. The magnetization curves evidence that the fieldinduced transition occurs from phase IV into phase II′ through a mixed phase of both phases, where phase IV is antiferromagnetic and phase II′ is a field-induced phase with the antiferromagnetic and antiferroquadrupolar order. The mixed phase (IV + II′) is enhanced by the Y-dilution, and the lower and upper verges of the mixed phase become clearer in the differential magnetization dM=dB-B curves. The Y-dilution results in scaling down of the ordered phases regions in the B-T space. The ways of scale down of the ordered phase are different between two field directions along the tetragonal [100] and [110]-axes, that is, the anisotropy of phase stability is increased by the Y dilution. It is supposed that the enhancement of anisotropic phase stability by the Y dilution may be due to the symmetry of the multipoles and the anisotropic multipolar interactions weakened by the Y dilution.

Original languageEnglish
Article number074704
Journaljournal of the physical society of japan
Volume75
Issue number7
DOIs
Publication statusPublished - 2006 Jul 1

Keywords

  • Antiferromagnetic transition
  • Antiferroquadrupolar order
  • Phase diagram
  • TbBC
  • Y dilution

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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