Refinement of the crystal structure of Co3V2O8 and Ni3V2O8

Sauerbrei, Eric E.; Faggiani, R.; Calvo, C.

doi:10.1107/s0567740873006552

Cited by 108 publications

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“…1(a). 8 This structure has the coordination and two-dimensionality of the regular kagomé lattice, but the kagomé planes are buckled. The system is particularly attractive because its complex magnetic phase diagram can be understood on the basis of an embellished kagomé spin hamiltonian.…”

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confidence: 99%

Competing Magnetic Phases on a Kagomé Staircase

et al. 2004

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We present thermodynamic and neutron data on Ni3V2O8, a spin-1 system on a kagomé staircase. The extreme degeneracy of the kagomé antiferromagnet is lifted to produce two incommensurate phases at finite T -one amplitude modulated, the other helical -plus a commensurate canted antiferromagnet for T → 0. The H − T phase diagram is described by a model of competing first and second neighbor interactions with smaller anisotropic terms. Ni3V2O8 thus provides an elegant example of order from sub-leading interactions in a highly frustrated system. PACS numbers: 75.10. Jm, 75.25.+z, 75.30.Kz Geometrical magnetic frustration leads to unusual low temperature spin order and dynamics and presents new challenges for the theoretical understanding of magnetic systems. Frustrated materials are often characterized by triangle-based lattices and short-range antiferromagnetic (AF) interactions. 1 Of particular interest has been magnetism on the two-dimensional (2D) kagomé lattice, which consists of corner-sharing triangles. While the Heisenberg spin-1/2 model appears to have short range spin correlations and a gap to free spinons, 2,3 the S → ∞ classical model has Néel order with a √ 3 × √ 3 unit cell at temperature T = 0. 4 Materials that approximate the kagomé AF can be expected to lie close to a quantum critical point, and indeed early work on the kagomé system SCGO exposed a spin liquid phase possessing a large fraction (15%) of the total spin entropy and short range √ 3 × √ 3 order. 5,6 Later work on jarosite systems showed different "q = 0" long range order apparently favored by interlayer interactions. 7Here we study Ni 3 V 2 O 8 (NVO) in which the S = 1 Ni 2+ spins form the orthorhombic kagomé staircase structure shown in Fig. 1(a). 8 This structure has the coordination and two-dimensionality of the regular kagomé lattice, but the kagomé planes are buckled. The system is particularly attractive because its complex magnetic phase diagram can be understood on the basis of an embellished kagomé spin hamiltonian. The model we introduce also applies to the isostructural compounds where Ni is replaced by Cu 9 or Co. 10 Although the symmetry of these compounds is the same as that of NVO, their phase diagrams are very different. As indicated below, this difference results from a small quantitative change in the parameters which dictate how frustration is relieved.A previous study of the magneto-thermal response in polycrystalline NVO revealed four zero field phase transitions with Θ W /T N > 5, where Θ W is the Weiss constant and T N the magnetic ordering temperature. 10 In this letter we report an unexpectedly rich anisotropic field-temperature (H − T ) phase diagram (Fig. 2), with high and low temperature incommensurate (IC) phases (HTI and LTI) and two commensurate (C and C') spin structures. These magnetic structures are determined via neutron diffraction. We also explain the salient features of NVO by a model, in which the spine (Ni s ) and cross-tie (Ni c ) spins interact via nearest neighbor (NN) and second nearest-neigh...

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Competing Magnetic Phases on a Kagomé Staircase

et al. 2004

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“…Staircase Kagome lattice with buckled Kagomé layers is one example, which has been realized in several materials, including A 3 V 2 O 8 (A= Cu,Co,Ni) [7][8][9] and PbCu 3 TeO 7 [10] . Consecutive magnetic transitions and magnetism induced ferroelectricity were reported in Ni 3 V 2 O 8 , characterizing a multiferroic material with strong magnetoelectric coupling [11,12] .…”

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confidence: 99%

Nuclear-Magnetic-Resonance Properties of the Staircase Kagomé Antiferromagnet PbCu ₃ TeO ₇

Jia

Wang

Sun

et al. 2015

Chinese Phys. Lett.

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We report the first nuclear magnetic resonance (NMR) study on single crystals of staircase Kagomé antiferromagnet PbCu 3 TeO 7 (T N1~3 6 K). A Curie constant Θ~-140 K is obtained by a Curie-Weiss fit to the high-temperature Knight shift of 125 Te. The hyperfine coupling constant is estimated as 125 A hf = -67 kOe/μ B , and a strong interlayer coupling among staircase Kagomé planes is suggested with such a large hyperfine

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“…The crystallographic structure (orthorhombic space group Cmca) [1,2] is interesting with respect to the magnetic properties as the magnetic ions form buckled planes of corner-sharing isosceles triangles representing an anisotropic variation of the ideal Kagomé net. Within these buckled planes, the Kagomé staircases, cross-tie ions on crystallographic (4a) sites link the linear chains of spine ions on (8e) sites.…”

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“…This result shows once again that the competition of the exchange interactions along various coupling pathways in this particular crystallographic system results in a variety of different interesting magnetic structures. 2 , which creates Co 4 O 15 tetramers of facesharing octahedra connected to their extremities to isolated tetrahedra by corner-sharing. This material is strongly related to the 12H-BaCoO 2.6 [2] and 6H-Ba 6 Co 6 ClO 16 [3] cobaltites, with the existence of common blocks.…”

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“…2 , which creates Co 4 O 15 tetramers of facesharing octahedra connected to their extremities to isolated tetrahedra by corner-sharing. This material is strongly related to the 12H-BaCoO 2.6 [2] and 6H-Ba 6 Co 6 ClO 16 [3] cobaltites, with the existence of common blocks. Measurement of the magnetic susceptibility χ against T has been performed under applied magnetic field of 1 T. The experiment reveals the existence of two transitions at 60 K and 30 K. The curve was fitted to the Curie-Weiss law in the paramagnetic domain (above 60 K), leading to the values p eff =3.12 µB/Co and θ=55K This paramagnetic effective moment can be explained by assuming Co 3+ S=1 and Co 4+ S=3/2 i.e.…”

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Magnetic structure of the Kagomé mixed compound (Co_0.5Ni_0.5)₃V₂O₈

Qureshi¹,

Fueß²,

Ehrenberg³

et al. 2007

Acta Cryst Sect A

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(Co 0.5 Ni 0.5 ) 3 V 2 O 8 represents a mixed compound of the well investigated transition metal (M) orthooxovanadates Ni 3 V 2 O 8 (NVO) and Co 3 V 2 O 8 (CVO) labelled as Kagomé staircase structures, which are characterized by edgesharing MO 6 octahedra isolated by nonmagnetic VO 4 tetrahedra. The crystallographic structure (orthorhombic space group Cmca) [1, 2] is interesting with respect to the magnetic properties as the magnetic ions form buckled planes of corner-sharing isosceles triangles representing an anisotropic variation of the ideal Kagomé net. Within these buckled planes, the Kagomé staircases, cross-tie ions on crystallographic (4a) sites link the linear chains of spine ions on (8e) sites. Due to the reduced symmetry of the Kagomé staircase geometry with respect to the ideal plane net the degree of frustration is lowered leading to interesting long range ordered magnetic structures. Magnetization and neutron diffraction experiments on a (Co 0.52 Ni 0.48 ) 3 V 2 O 8 powder sample [3] revealed only one magnetic phase transition into an antiferromagnetic ground state in contrast to the richness of magnetic phase transitions of its parent compounds [4,5]. The magnetic structure is modulated by a composition dependent propagation vector k=(δ, 0, 0) with δ being 0.491(4) for (Co 0.52 Ni 0.48 ) 3 V 2 O 8 where a similarity to the NVO type magnetic structure was assumed [3]. Neutron single crystal diffraction experiments followed by group theory analysis produced a more detailed picture. The magnetic structure of (Co 0.5 Ni 0.5 ) 3 V 2 O 8 exhibits features, which differ from the predominantly collinear alignment of its parent compounds NVO and CVO, which exhibit a variety of magnetic structures with magnetic moments mainly oriented along the a axis [4][5][6][7]. The averaged magnetic moments of the statistically distributed Ni 2+ and Co 2

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Refinement of the crystal structure of Co₃V₂O₈ and Ni₃V₂O₈

Cited by 108 publications

References 1 publication

Competing Magnetic Phases on a Kagomé Staircase

Competing Magnetic Phases on a Kagomé Staircase

Nuclear-Magnetic-Resonance Properties of the Staircase Kagomé Antiferromagnet PbCu ₃ TeO ₇

Magnetic structure of the Kagomé mixed compound (Co_0.5Ni_0.5)₃V₂O₈

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Refinement of the crystal structure of Co3V2O8 and Ni3V2O8

Cited by 108 publications

References 1 publication

Competing Magnetic Phases on a Kagomé Staircase

Competing Magnetic Phases on a Kagomé Staircase

Nuclear-Magnetic-Resonance Properties of the Staircase Kagomé Antiferromagnet PbCu 3 TeO 7

Magnetic structure of the Kagomé mixed compound (Co0.5Ni0.5)3V2O8

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Refinement of the crystal structure of Co₃V₂O₈ and Ni₃V₂O₈

Nuclear-Magnetic-Resonance Properties of the Staircase Kagomé Antiferromagnet PbCu ₃ TeO ₇

Magnetic structure of the Kagomé mixed compound (Co_0.5Ni_0.5)₃V₂O₈