Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO₄

Abstract

A ferroelectric transition occurring simultaneously with helical spin order has been found in both the polycrystalline and single crystal samples of LiCuVO 4 . The system has Cu 2+ spins (s=1/2) of the CuO 2 chains formed of edge-sharing CuO 4 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 e 3 perpendicular to the CuO 4 squares. The electric polarization P can be understood by the recently predicted relation P ∝ Q×e 3 . The transition temperature has been found to be gradually suppressed by the applied magnetic field.

Cupric chlorideCuCl2as anS=12chain multiferroic

“…11 In case of LiCuVO 4 , P a is found in ab-spiral spin phase at 0 T, consistent with the IDM model. 16,17 However, the observation of P c, assigned to the bc-spiral spin phase, 18 was not reproduced by another group. 19 Since both compounds frequently contains Li-Cu intersubstitution due to their close ionic radii, Moskvin et al have claimed that the observed FE and ME natures stem purely from exchange striction and crystallographic defects, not from the spin-orbit interaction (or the IDM scheme).…”

Vector chiral and multipolar orders in the spin-12frustrated ferromagnetic chain in magnetic field

“…In particular, there have been intensive experimental studies of LiCuVO 4 , exploring an unusual phase transition in magnetic field from a spiral-ordered phase to a modulated-collinear-ordered phase 12,13 and a multiferroic behavior. 14,15,16 From a theoretical point of view, the J 1 -J 2 spin chain (1) is of special interest as it is the simplest of the frustrated quantum spin models and provides a good testing ground to look for exotic quantum phases induced by frustration. The theoretical studies over the past several decades have mostly considered the case where both couplings are antiferromagnetic, J 1 > 0 and J 2 > 0.…”

Dielectric anomaly in the quasi-one-dimensional frustrated spin-12system Rb2(Cu1−Yasui1, Yanagisawa2, Okazaki3 et al. 2013Phys. Rev. BSelf Cite150120View full textAdd to dashboardCite

“…A coexistence of magnetic and ferroelectric orders called multiferroic phenomena can be listed as one of the examples of these phenomena. [2][3][4][5][6][7] Quasi one-dimensional Cu 2+ spin (S=1/2) chains of edge-sharing CuO 4 square planes are called CuO 2 ribbon chains. In such systems, the next-nearest-neighbor exchange interaction J 2 through the Cu-O-O-Cu exchange paths is antiferromagnetic (J 2 > 0), and the nearest-neighbor exchange interaction J 1 through the Cu-O-Cu paths is ferromagnetic (J 1 < 0), because the Cu-O-Cu angle is close to 90º.…”

“…Because the Ni 2+ impurity can bridge the neighboring spins, the short range ordering is and PbCuSO 4 (OH) 2 with the CuO 2 ribbon chain systems, the ferroelectricty is induced by the helical magnetic structure below T N . [2][3][4]6,7 Even if the magnetic transition does not exist, the dielectric anomaly is found to be induced by the short range helical ordering .…”

“…That is interesting another topic of the title compound and several measurements below 2 K are in progress. Since |J 2 28 in an inelastic neutron scattering at 3K where a dispersion curve ascends from an incommensurate Q-value (Q ~ 0.1 rlu) at E=0. The incommensurate Q-value indicates a non-collinear or helical spin structure.…”