Structural Anomalies and Multiferroic Behavior in Magnetically Frustrated TbMn2O5

L.C. Chapon, G.R. Blake, M.J. Gutmann, S. Park, N. Hur, P.G. Radaelli, S-W. Cheong

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Abstract

We have studied the magnetostructural phase diagram of multiferroic TbMn2O5 as a function of temperature and magnetic field by neutron diffraction. Dielectric and magnetic anomalies are found to be associated with steps in the magnetic propagation vector, including a rare example of a commensurate-incommensurate transition on cooling below 24 K, and in the structural parameters. The geometrically frustrated magnetic structure is stabilized by ‘‘canted antiferroelectric’’ displacements of the Mn3+ ions, an example of the magnetic Jahn-Teller effect. The Tb moments order ferromagnetically at low temperatures in an applied field, while the Mn magnetic structure is largely unchanged.
Original languageEnglish
Pages (from-to)177402-1-177402-4
JournalPhysical Review Letters
Volume93
Issue number17
DOIs
Publication statusPublished - 2004

Keywords

  • frustration
  • pyroelectricity
  • permittivity
  • dielectric polarisation
  • antiferroelectric materials
  • magnetic moments
  • Jahn-Teller effect
  • neutron diffraction
  • commensurate-incommensurate transformations
  • magnetic structure
  • solid-state phase transformations
  • terbium compounds

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