Lattice Modulation Induced by Magnetic Order in DyZn2

Yusuke Wakabayashi, Nobuyoshi Wakabayashi, Tetsuo Kitai

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

DyZn2 has an orthorhombic CeCu2-type structure. Between 29 K and the Néel temperature of 35 K, the magnetic structure is that of sinusoidal modulation characterized by a wavevector qmmc*, where ζm is approximately 0.45 (MAF). The magnetic moments are parallel to the b-axis and, hence, the modulation is transverse. Below 29 K, the wavevector is 0.5c* and the compound is a simple antiferro magnet. On this study, X-ray diffraction measurements were carried out on a single crystal of DyZn2. There is an anomaly in the thermal expansion at the Néel temperature, and satellite peaks were observed at 2qm in the MAF phase. The amplitude of the lattice modulation u was observed to depend on ζm. The fact that the lattice modulation has wavevector 2qm has been examined on the basis of a model which takes into account modifications of the exchange interactions due to atomic displacements. Furthermore, the same model can explain the change of the thermal expansion. Measurements in magnetic fields up to 1.4 T were also performed. A new satellite peak was observed at (0 0 6+ζm) in fields. The appearance of the new satellite peak is expected by the model. The magnetic phase diagram was determined by measurements of satellite peaks at various temperatures and magnetic fields.

Original languageEnglish
Pages (from-to)3901-3905
Number of pages5
Journaljournal of the physical society of japan
Volume67
Issue number11
DOIs
Publication statusPublished - 1998 Jan 1
Externally publishedYes

Keywords

  • Lattice modulation
  • Magnetic order
  • Satellite peaks
  • X-ray diffraction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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