Identification of microscopic spin-polarization coupling in the ferroelectric phase of a magnetoelectric multiferroic CuFe1-xAlxO2

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dc.creatorNakajima, Taro
dc.creatorMitsuda, Setsuo
dc.creatorInami, Toshiya
dc.creatorTerada, Noriki
dc.creatorOhsumi, Hiroyuki
dc.creatorProkes, Karel
dc.creatorPodlesnyak, Andrei
dc.date2008-06-12
dc.date.accessioned2026-07-07T09:51:07Z
dc.date.available2026-07-07T09:51:07Z
dc.descriptionWe have performed synchrotron radiation X-ray and neutron diffraction measurements on magnetoelectric multiferroic CuFe1-xAlxO2 (x=0.0155), which has a proper helical magnetic structure with incommensurate propagation wave vector in the ferroelectric phase. The present measurements revealed that the ferroelectric phase is accompanied by lattice modulation with a wave number 2q, where q is the magnetic modulation wave number. We have calculated the Fourier spectrum of the spatial modulations in the local electric polarization using a microscopic model proposed by Arima [T. Arima, J. Phys. Soc. Jpn. 76, 073702 (2007)]. Comparing the experimental results with the calculation results, we found that the origin of the 2q-lattice modulation is not conventional magnetostriction but the variation in the metal-ligand hybridization between the magnetic Fe^3+ ions and ligand O^2- ions. Combining the present results with the results of a previous polarized neutron diffraction study [Nakajima et al., Phys. Rev. B 77 052401 (2008)], we conclude that the microscopic origin of the ferroelectricity in CuFe1-xAlxO2 is the variation in the metal-ligand hybridization with spin-orbit coupling.
dc.description11 pages, 9 figures, to be published in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/0806.2004
dc.identifierhttp://arxiv.org/abs/0806.2004
dc.identifierPhys. Rev. B 78, 024106 (2008) (10 pages)
dc.identifierdoi:10.1103/PhysRevB.78.024106
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/165179
dc.subjectStrongly Correlated Electrons
dc.titleIdentification of microscopic spin-polarization coupling in the ferroelectric phase of a magnetoelectric multiferroic CuFe1-xAlxO2
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