Quadrupole and hexadecapole ordering in DyB2C2: Direct observation with resonant x-ray diffraction

Yoshikazu Tanaka, Toshiya Inami, Stephen W. Lovesey, Kevin S. Knight, Flora Yakhou, Danny Mannix, Masayuki Kanazawa, Kohtaro Ishida, Susumu Nanao, Tetsuya Nakamura, Hiroki Yamauchi, Hideya Onodera, Kenji Ohoyama, Yamaguchi Nakamura

研究成果: Article査読

36 被引用数 (Scopus)

抄録

Direct evidence of the spatial ordering of Dy 4f quadrupole and hexadecapole moments in DyB2C2 is demonstrated by resonant x-ray diffraction enhanced by an electric quadrupole event (E2 resonance) at the Dy LIII absorption edge. The diffraction data show that the structural phase transition at TQ = 24.7K is accompanied by a reduction in the symmetry of the Dy site to 2/m, from 4/m, and the spatial ordering of the time-even Dy multipoles with Ag character. Below TQ the crystal structure is described by the space group P4 2/mnm and Dy ions occupy sites (4c). The distortion at TQ involves the lattice occupied by B and C ions, and it amounts to a buckling of B-C planes that are normal to the two-fold rotation axis of 2/m. An immediately plausible model of low-energy Dy states correlates data on the specific heat, our x-ray diffraction signals, and magnetic ordering below 15.3 K which has been observed in magnetic neutron diffraction.

本文言語English
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
69
2
DOI
出版ステータスPublished - 2004 1月 29
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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