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Multiferroicity in spin ice: Bilayered crystal of magnetic monopoles in Tb2Ti2O7
Leon Brillouin Laboratory,CEA de Saclay 91191 Gif-sur-Yvette, France
Tue, Sep. 20th 2016, 14:15
LLB - Bât 563 p15 (Grande Salle), CEA-Saclay


In geometrically frustrated pyrochlore magnets, the magnetic interactions cannot be simultaneously satisfied, leading to short-range magnetic orders called spin ices or spin liquids. Spin ice support an extensively degenerate ground state and ensure the local conservation of magnetic fluxes. Such flux conservation can be described as Coulomb spin liquid by analogy with Maxwell’s electromagnetism where excitations take the form of emergent magnetic monopole. It was found that under a field spin liquid Tb2Ti2O7 orders as a three dimensional arrangement of magnetic monopole and antimonopole double layers (A. Sazonov et al. Phys. Rev. B 85, 214420,2012). Recent theory shows that magnetoelectric coupling in pyrochlores is able to lift the degeneracy and to manipulate topological excitations. As a result the electric dipolar interactions can be responsible for the emergence of the double-layer structure of monopoles (L. D. C. Jaubert and R. Moessner Phys. Rev B 91, 214422, 2015) .

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