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    • Direct transition from a disordered to a multiferroic phase on a triangular lattice 

      Kenzelmann, M.; Lawes, G.; Harris, A. B.; Gasparovic, G.; Broholm, C.; Ramirez, A. P.; Jorge, G.A.; Jaime, M.; Park, S.; Huang, Q.; Shapiro, A. Y.; Demianets, L. A. (American Physical Society, 2007-06-29)
      We report the first direct transition from a paramagnetic and paraelectric phase to an incommensurate multiferroic in the triangular lattice antiferromagnet RbFe(MoO4)2. Ferroelectricity is observed only when the magnetic ...
    • Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3 

      Kenzelmann, M.; Harris, A. B.; Jonas, S.; Broholm, C.; Schefer, J.; Kim, S. B.; Zhang, C.L.; Cheong, S.-W.; Vajk, O. P.; Lynn, J. W. (American Physical Society, 2005-08-19)
      TbMnO3 is an orthorhombic insulator where incommensurate spin order for temperature TN<41 K is accompanied by ferroelectric order for T<28 K. To understand this, we establish the magnetic structure above and below the ...