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

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

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.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume69
Issue number2
DOIs
Publication statusPublished - 2004 Jan 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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