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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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.
Originele taal-2English
Pagina's (van-tot)177402-1-177402-4
TijdschriftPhysical Review Letters
Nummer van het tijdschrift17
StatusPublished - 2004

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