Origin of the multiferroic spiral spin-order in the RMnO3 perovskites

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dc.creatorDong, Shuai
dc.creatorYu, Rong
dc.creatorYunoki, Seiji
dc.creatorLiu, J. -M.
dc.creatorDagotto, Elbio
dc.date2008-07-15
dc.date2008-10-21
dc.date.accessioned2026-07-07T10:11:56Z
dc.date.available2026-07-07T10:11:56Z
dc.descriptionThe origin of the spiral spin-order in perovskite multiferroic manganites $R$MnO$_{3}$ ($RE=$ Tb or Dy) is here investigated using a two $e_{\rm g}$-orbitals double-exchange model. Our main result is that the experimentally observed spiral phase can be stabilized by introducing a relatively weak next-nearest-neighbor superexchange coupling ($\sim10%$ of the nearest-neighbor superexchange). Moreover, the Jahn-Teller lattice distortion is also shown to be essential to obtain a realistic spiral period. Supporting our conclusions, the generic phase diagram of undoped perovskite manganites is obtained using Monte Carlo simulations, showing phase transitions from the A-type antiferromagnet, to the spiral phase, and finally to the E-type antiferromagnet, with decreasing size of the $R$ ions. These results are qualitatively explained by the enhanced relative intensity of the superexchanges.
dc.description6 pages, 4 figures
dc.identifierhttps://arxiv.org/abs/0807.2395
dc.identifierhttp://arxiv.org/abs/0807.2395
dc.identifierPhys. Rev. B 78, 155121 (2008)
dc.identifierdoi:10.1103/PhysRevB.78.155121
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/172021
dc.subjectStrongly Correlated Electrons
dc.subjectMaterials Science
dc.titleOrigin of the multiferroic spiral spin-order in the RMnO3 perovskites
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