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Multiferroicity due to nonstoichiometry in the chain cuprate LiVCuO4

A. S. Moskvin1 and S.-L. Drechsler2

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The recently observed multiferroic behavior in the s=1/2 chain cuprate LiVCuO4 (≡LiCuVO4) with edge-shared CuO4 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

77.80.-e Ferroelectricity and antiferroelectricity

75.10.Pq Spin chain models

74.72.-h Cuprate superconductors (high-Tc and insulating parent compounds)

Subjects

Superconductivity

Condensed matter: electrical, magnetic and optical

Dates

Issue 5 (March 2008)

Received 6 August 2007, accepted for publication 1 January 2008

Published 4 February 2008



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