期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 76, 期 2, 页码 -出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.76.023708
关键词
LiCuVO4; multiferroics; helical magnetic order; incommensurate magnetic structure
A ferroelectric transition occurring simultaneously with a 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 a 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 e(3) perpendicular to the CuO4 squares. The electric polarization P can be understood by the recently predicted relation P proportional to Q x e(3). The transition temperature has been found to be gradually suppressed by the applied magnetic field.
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