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

DOI: 10.1103/PhysRevB.69.024417 DOI Help

Authors: Yoshikazu Tanaka (RIKEN, Japan) , Toshiya Inami (Japan Atomic Energy Research Institute, Japan) , Stephen Lovesey (Diamond Light Source) , Kevin Knight (Diamond Light Source) , Flora Yakhou (ESRF, France) , Danny Mannix (ESRF, France) , Jun Kokubun (Department of Physics, Tokyo University of Science, Japan) , Masayuki Kanazawa (Department of Physics, Tokyo University of Science, Japan) , Kohtaro Ishida (Department of Physics, Tokyo University of Science, Japan) , Susumu Nanao (Institute of Industrial Science, The University of Tokyo, Japan) , Tetsuya Nakamura (Institute of Industrial Science, The University of Tokyo, Japan) , Hiroki Yamauchi (Institute for Materials Research, Tohoku University, Japan) , Hideya Onodera (Institute for Materials Research, Tohoku University, Japan) , Kenji Ohoyama (Institute for Materials Research, Tohoku University, Japan) , Yasuo Yamaguchi (Institute for Materials Research, Tohoku University, Japan)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 69 (2)

State: Published (Approved)
Published: January 2004

Abstract: Direct evidence of the spatial ordering of Dy 4 f 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 TQ524.7 K 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 P42 /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.

Subject Areas: Physics

Facility: ESRF; PF