Spin-lattice coupling in ferroelectric spiral magnets: Comparison between the cases of (Tb,Dy)MnO3 and CoCr2O4

Taka Hisa Arima, Yuichi Yamasaki, Takeshi Goto, Satoshi Iguchi, Kenya Ohgushi, Shigeki Miyasaka, Yoshinori Tokura

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

Lattice modulation expected for various types of spiral magnetic ordering with a propagation vector Qm is discussed in terms of the symmetric (Si·Sj type) and antisymmetric (Si x Sj type) exchange interactions between neighboring spins (S i and Sj). We show that the conical ordering causes the superlattice modulation with Qm via the antisymetric interaction, while the elliptical deformation of spiral induces a 2Qm modulation in lattice, due to the symmetric and antisymmetric interactions. This theoretical prediction was experimentally confirmed for a transverse elliptical antiferromagnet (Tb,Dy)MnO3 and a transverse conical ferrimagnet CoCr2O4, both accompanied by ferroelectricity (lattice deformation with Q = 0) as well.

Original languageEnglish
Article number023602
Journaljournal of the physical society of japan
Volume76
Issue number2
DOIs
Publication statusPublished - 2007 Feb
Externally publishedYes

Keywords

  • Conical magnet
  • Cycloid
  • Exchange striction
  • Multiferroics
  • Perovskite manganese oxide
  • Spinel cobalt oxide
  • Spiral magnet
  • Superlattice
  • Synchrotron x-ray diffraction

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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