Induced ferroelectric phases in TbMn_2O_5

Abstract

The magnetostructural transitions and magnetoelectric effects reported in TbMn2O5 are described theoretically and shown to correspond to two essentially different mechanisms for the induced ferroelectricity. The incommensurate and commensurate phases observed between 38 and 24 K exhibit a hybrid pseudoproper ferroelectric nature resulting from an effective bilinear coupling of the polarization with the antiferromagnetic order parameter. This explains the high sensitivity of the dielectric properties of the material under applied magnetic field. Below 24 K the incommensurate phase shows a standard improper ferroelectric character induced by the coupling of two distinct magnetic order parameters. The complex dielectric behavior observed in the material reflects the crossover from one to the other transition regime. The temperature dependences of the pertinent physical quantities are worked out, and previous theoretical models are discussed.

References in corpus (17)

• Spin current and magneto-electric effect in non-collinear magnets
• Ferroelectricity in spiral magnets
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Magnetic inversion symmetry breaking and ferroelectricity in TbMnO3
• Magnetically driven ferroelectric order in Ni${}_3$V${}_2$O${}_8$
• Ferroelectric polarization flop in a frustrated magnet MnWO${}_4$ induced by magnetic fields
• Spin structure and magnetic frustration in multiferroic RMn2O5 (R = Tb, Ho, Dy)
• Ferroelectricity induced by acentric spin-density waves in YMn${}_2$O${}_5$
• Erratum: Landau Analysis of the Symmetry of the Magnetic Structure and Magnetoelectric Interaction in Multiferroics [Phys. Rev. B 76, 05447 (2007)]
• A Neutron diffraction study of multiferroics RMn2O5
• Electromagnons in multiferroic RMn2O5 compounds and their microscopic origin
• Microscopic origin of Magnetic Ferroelectrics in Nonlinear Multiferroics
• Non-resonant and Resonant X-ray Scattering Studies on Multiferroic TbMn2O5
• Symmetry constraints on the electrical polarization in novel multiferroic materials
• Manipulating the magnetic structure by electric fields in multiferroic ErMn2O5
• Effect of Inversion Symmetry on Incommensurate Order in Multiferroic RMn2O5, R=rare earth
• Order Parameters and Phase Diagrams of Multiferroics

Cited by in corpus (6)

• Antiferromagnetically spin polarized oxygen observed in magneto-electric TbMn2O5
• Topology and manipulation of multiferroic hybrid domains in MnWO${}_4$
• Directional magnetoelectric effects in MnWO4: magnetic sources of the electric polarization
• Landau model for the phase diagrams of the orthorhombic rare-earth manganites RMnO3
• Independent ferroelectric contributions and rare-earth-induced polarization reversal in multiferroic TbMn2O5
• Magnetic and magnetoelectric properties of $A$FeF${}_5$ ($A$ = Ca, Sr) spin-chain compounds