Control of magnetic interaction and ferroelectricity by nonmagnetic Ga substitution in multiferroic YMn2O5

H. Kimura, Y. Sakamoto, M. Fukunaga, H. Hiraka, Y. Noda

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We have studied the effects of substituting nonmagnetic Ga3+ for Mn3+ on dielectric and magnetic properties in multiferroic YMn 2O5. Upon Ga substitution, whereby only the Mn3 + ions are selectively replaced, the commensurate magnetic phase eventually disappeared owing to the disconnection of the magnetic interaction between Mn3+ and Mn4+ ions. In contrast, the low-temperature incommensurate magnetic phase is hardly affected by Ga substitution. Precise crystal structure analyses of Ga-substituted YMn 2O5 have revealed that the bonds between Mn ions along the ab plane changed markedly with increasing Ga concentration, while those along the c axis did not change at all. This indicates that the magnetic interactions along the ab plane were altered dramatically, while those along the c axis were robust against Ga substitution. From the dielectric and magnetic phase diagrams as a function of Ga substitution, we conclude that the electric polarization is predominantly induced by exchange-striction in the commensurate magnetic phase, and by an inverse Dzyaloshinskii-Moriya interaction in the incommensurate phase.

Original languageEnglish
Article number104414
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume87
Issue number10
DOIs
Publication statusPublished - 2013 Mar 29

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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