Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO4

Details Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO4 Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO4

2006-11-27

arxiv.org/abs/cond-mat/0611659v2

J. Phys. Soc. Jpn. 76 (2007) 023708.

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures, submitted to JPSJ

Scientific paper

A ferroelectric transition occurring simultaneously with helical spin order has been found in both the polycrystalline and single crystal samples of LiCuVO4. The system has Cu2+ spins (s=1/2) of the CuO2 chains formed of edge-sharing CuO4 squares. Possibly due to the frustrated nature caused by the competition between the nearest-neighbor and next-nearest-neighbor exchange interactions, Cu spins exhibit, as has been already reported, the helical magnetic order with the incommensurate modulation vector Q along the chain direction and with the helical axis e3 perpendicular to the CuO4 squares. The electric polarization P can be understood by the recently predicted relation (P is proportional to Q*e3). The transition temperature has been found to be gradually suppressed by the applied magnetic field.

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