Volume 81, Number 5, March 2008
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||04 February 2008|
Multiferroicity due to nonstoichiometry in the chain cuprate LiVCuO4
Ural State University - 620083 Ekaterinburg, Russia
2 Leibniz Institut für Festkörper- und Werkstoffforschung Dresden - D-01171, Dresden, Germany
Accepted: 1 January 2008
The recently observed multiferroic behavior in the chain cuprate LiVCuO4 (≡ LiCuVO4) with edge-shared plaquettes and helical spin ordering does not agree with the existing theories such as a spin-current scenario. We argue that the effect can be consistently explained, if the exchange-induced electric polarization on the out-of-chain Cu2+ centers substituting for Li ions in LiVCuO4 is taken into account. These substituent centers are proved to be an effective probe of the spin incommensurability and the magnetic-field effects.
PACS: 74.72.-h – Cuprate superconductors (high-Tc and insulating parent compounds) / 75.10.Pq – Spin chain models / 77.80.-e – Ferroelectricity and antiferroelectricity
© EPLA, 2008
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