Ferroelectricity and lattice distortion associated with spin orderings in a multiferroic delafossite AgFeO2

Noriki Terada; Dmitry D. Khalyavin; Pascal Manuel; Yoshihiro Tsujimoto; Kevin Knight; Paolo G. Radaelli; Hiroyuki S. Suzuki; Hideaki Kitazawa

doi:10.1051/epjconf/20134015008

EPJ

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Proceedings

Open Access

EPJ Web of Conferences 40, 15008 (2013)
https://doi.org/10.1051/epjconf/20134015008

Ferroelectricity and lattice distortion associated with spin orderings in a multiferroic delafossite AgFeO₂

Noriki Terada¹^,2^,3^a, Dmitry D. Khalyavin², Pascal Manuel², Yoshihiro Tsujimoto¹, Kevin Knight², Paolo G. Radaelli³, Hiroyuki S. Suzuki¹ and Hideaki Kitazawa¹

¹ National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan
² ISIS facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, United Kingdom
³ Clarendon Laboratory, Department of Physics, University of Oxford, Parks Road, Oxford OX1 3PU, United Kingdom

^a e-mail: terada.noriki@nims.go.jp

Abstract

Spin-lattice coupling and ferroelectric polarization associated with the magnetic ordering in a geometrically frustrated delafossite AgFeO₂ have been studied by high resolution neutron powder diffraction and dielectric measurements. The cycloidal magnetic ground state found in this material and the character of the lattice distortions are unprecedented in the family of the delafossite compounds, implying a peculiar mechanism lifting the geometrical frustration.

© Owned by the authors, published by EDP Sciences, 2013