Multiferroicity due to nonstoichiometry in the chain cuprate LiVCuO_4

Abstract

The recently observed multiferroic behavior in the s=1/2 chain cuprate LiVCuO_4 (LiCuVO_4) with edge-shared CuO_4 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 Cu^2+ centers substituting for Li-ions in LiVCuO_4 is taken into account. These substituent centers are proved to be an effective probe of the spin incommensurability and the magnetic field effects.

arXiv comment7 pages, 5 figures, accepted in Europhys. Letters

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• Cupric chloride CuCl2 as an S=1/2 chain multiferroic
• Microscopic mechanisms of spin-dependent electric polarization in 3d oxides
• Thermodynamic Properties of the Anisotropic Frustrated Spin-chain Compound Linarite PbCuSO${}_4$(OH)${}_2$
• The strength of frustration and quantum fluctuations in LiVCuO4
• Dzyaloshinskii-Moriya coupling in 3d insulators
• Nonrelativistic Multiferroicity in the Nonstoichiometric Spin s=1/2 Spiral Chain Cuprate LiCu2O2
• Magnetic structure of the edge-sharing copper oxide chain compound NaCu2O2
• Dzyaloshinskii interaction and exchange-relativistic effects in orthoferrites
• Electronic structure, magnetic and dielectric properties of the edge-sharing copper-oxide chain compound NaCu${}_2$O${}_2$
• Colossal magnetocapacitive effect in differently synthesized and doped CdCr2S4
• Uniform spin chain physics arising from NCN bridges in CuNCN: surprises on the way from copper oxides to their nitride analogs
• Microscopic mechanisms of spin-dependent electric polarization in 3d oxides
• Electric field driven flat bands: Enhanced magnetoelectric and electrocaloric effects in frustrated quantum magnets
• Spin polarization of the magnetic spiral in NaCu_2O_2, as seen by NMR
• Spiral ground state in the quasi-two-dimensional spin-1/2 system Cu2GeO4
• The magnetoelectric coupling in the multiferroic compound LiCu2O2