Existence of a critical canting angle of magnetic moments to induce multiferroicity in the Haldane spin-chain system, Tb2BaNiO5

Abstract

We report an unusual canted magnetism due to 3d and 4f electrons, occupying two different crystallographic sites, with its consequence to electric dipole order. This is based on neutron powder diffraction measurements on Tb2BaNiO5 (orthorhombic, Immm centrosymmetric space group), exhibiting Neel order below (TN) 63 K, to understand multiferroic behavior below 25 K. The magnetic structure is made up of Ni and Tb magnetic moments, which are found to be mutually canted in the entire temperature range below TN, though collinearity is seen within each sublattice, as known in the past. First-principles density functional theory calculations (GCA plus SO and GCA plus U plus SO approximations) support such a canted ground state. The intriguing finding, being reported here, is that there is a sudden increase in this Tb-Ni relative cantingle angle at the temperature (that is, at 25 K) at which spontaneous electric polarization sets in, with bond distance and bong angle anomalies. This finding emphasizes the need for a new spin-driven polarization mechanism, that is, a critical canting angle coupled with exchangestriction, to induce multiferroicity in magnetic insulators with canted spins.

arXiv comment18 pages including Supplementary Material

References in corpus (18)

• Spin current and magneto-electric effect in non-collinear magnets
• Ferroelectricity in spiral magnets
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology
• Magnetically driven ferroelectric order in Ni${}_3$V${}_2$O${}_8$
• Inversion symmetry breaking in noncollinear magnetic phase of a triangular lattice antiferromagnet CuFeO2
• Multiferroicity due to charge ordering
• Spin-polarization coupling in multiferroic transition-metal oxides
• A New Multiferroic Material: MnWO4
• Ferroelectric Transition Induced by the Incommensurate Magnetic Ordering in LiCuVO4
• Canted-spin-caused electric dipoles: a local symmetry theory
• Towards a Microscopic Model of Magnetoelectric Interactions in Ni3V2O8
• Ordering process and ferroelectricity in a spinel derived from FeV2O4
• Microscopic origin of Magnetic Ferroelectrics in Nonlinear Multiferroics
• First Principles Study of Structural, Electronic and Magnetic Interplay in Ferroelectromagnetic Yttrium Manganite
• Magnetoelectric coupling in Haldane spin chain system, Dy2BaNiO5
• Extraordinarily large intrinsic magnetodielectric coupling of Tb member within the Haldane spin-chain family, R2BaNiO5
• Multiferroicity and magneto-electric effect in Gd${}_2$BaNiO${}_5$

Cited by in corpus (5)

• Enhancement of magnetodielectric coupling in 6H-perovskites Ba3RRu2O9 for heavier rare earth cations (R=Ho,Tb)
• Origin of spin-driven ferroelectricity and effect of external pressure on the complex magnetism of 6H-perovskite Ba3HoRu2O9
• Destruction of multiferroicity in Tb2BaNiO5 by Sr doping and its implication to magnetoelectric coupling
• Anisotropic metamagnetism and magnetotransport of heavy rare-earth orthorhombic single-crystal TbAlGe
• Canting angle behavior of magnetic moments in Y- substituted Tb2BaNiO5 and its relevance for magnetoelectric coupling