Magnetically driven ferroelectric order in Ni3V2O8

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Title: Magnetically driven ferroelectric order in Ni3V2O8
Author: Lawes, G.; Harris, A.B.; Kimura, T.; Rogado, N.; Cava, R.J.; Aharony, A.; Entin-Wohlman, O.; Yildirim, T.; Kenzelmann, M.; Broholm, C.; Ramirez, A.P.
Abstract: We show that long-range ferroelectric and incommensurate magnetic order appear simultaneously in a single phase transition in Ni3V2O8. The temperature and magnetic-field dependence of the spontaneous polarization show a strong coupling between magnetic and ferroelectric orders. We determine the magnetic symmetry using Landau theory for continuous phase transitions, which shows that the spin structure alone can break spatial inversion symmetry leading to ferroelectric order. This phenomenological theory explains our experimental observation that the spontaneous polarization is restricted to lie along the crystal b axis and predicts that the magnitude should be proportional to a magnetic order parameter.
Date: 2005-08-19
Citation: Physical Review Letters 19 Aug. 2005, vol.95, no.8, pp. 087205/1-
Subject: Landau theory
spin structure
spatial inversion symmetry
magnetic-field dependence
temperature dependence
single phase transition
incommensurate magnetic order
long-range ferroelectric order
phenomenological theor
magnetic order parameter
magnetic transitions
dielectric polarization
ferroelectric materials
commensurate-incommensurate transformations

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