Neutron diffraction study of monoclinic brannerite-type CoV2O6

Markkula, Mikael; Arévalo‐López, Ángel M.; Attfield, J. Paul

doi:10.1016/j.jssc.2012.04.029

Cited by 35 publications

(51 citation statements)

References 17 publications

(23 reference statements)

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“…19 This is however based on the assumption that all these interactions are antiferromagnetic, in contradiction with our results for J 4 . However, the weak amplitude of this interaction, close to the accuracy limit of our method, as well as the neglect of potentially large magnetoelastic coupling effects, 7,17 can reasonably justify the reassessment of J 4 to a weak antiferromagnetic value.…”

Section: Magnetic Ordermentioning

confidence: 58%

Theoretical study of the magnetic order inα-CoV2O6

2013

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The electronic structure and magnetic properties of α-CoV 2 O 6 are investigated using density functional theory calculations including spin-orbit coupling and orbital polarization effects. These calculations reveal a strong magnetocrystalline anisotropy with a magnetization easy axis close to the c axis. The evaluation of magnetic couplings on the basis of broken-symmetry formalism suggests the occurrence of an antiferromagnetic ground-state order where ferromagnetic chains running along b are coupled antiferromagnetically to their nearest neighbors along a and c. Monte Carlo simulations are finally employed to explore the origins of the 1/3 plateau observed in the magnetization curves of this compound and to propose a structure for the corresponding state.

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Section: Magnetic Ordermentioning

confidence: 58%

Theoretical study of the magnetic order inα-CoV2O6

2013

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“…The intrachain ordering (b axis) along edge-sharing CoO 6 octahedra is expected ferromagnetic (see ref 26) as usually observed for plethora of systems with similar topologies. 2,[16][17][18]23,29 The second propagation vector modulates the first one, tuning the orientation of the spin in a 8-fold unit cell. This hypothesis is supported by the fact that the magnetic saturation is not totally reached at the F plateau and could explain the slope of the magnetization curve above 1 T (Figure 2a).…”

Section: Resultsmentioning

confidence: 99%

“…8 Although a propagation vector k = (1/2, 0, 0) was found, characterizing standard AF and F moment configurations along the a and c axes, respectively, there is no strong proof that the order inside the chains (i.e., along the b axis) is ferromagnetic as this was the case for the α phase. 16,18 Moreover, many magnetic satellite peaks could not be indexed. 8 The authors have therefore suggested the existence of incommensurate modulated magnetic structures related to the existence of the two different Co sites, as this was evidenced in other frustrated systems such as Ca 3 Co 2 O 6 .…”

Section: Introductionmentioning

confidence: 99%

Magnetic Structure of Ground and Field Induced Ordered States of Low-Dimensional γ-CoV₂O₆

et al. 2014

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The structural and magnetic properties of γ-CoV 2 O 6 low-dimensional magnetic oxide have been investigated with an emphasis on its magnetic structure. Our main results have been obtained by powder neutron diffraction measurements carried out under magnetic fields of 0, 0.52, and 1 T, corresponding to the antiferromagnetic, ferrimagnetic, and ferromagnetic configurations of the magnetic moments. The magnetic moments are not collinear, but lie mostly along the b direction (i.e., inside structural edge-sharing CoO 6 chains), which corresponds to the experimental easy magnetization axis. In the ground state, the moments are ferromagnetically ordered along the b and c directions, and antiferromagnetically ordered along a. The ferromagnetic sheets (bc plane) containing the chains are separated by nonmagnetic sheets containing VO 6 octahedra and VO 4 tetrahedra. The ground state magnetic structure can be described in a (4a, 2b, c) supercell using two antiferromagnetic propagation vectors k AF1 = (1/2, 0, 0) and k AF2 = (1/4, 1/2, 0). The ferri-and ferromagnetic structures are characterized by k Fi = (1/3, 0, −1/3) and k = (0, 0, 0) propagation vectors, respectively. These results are in agreement with macroscopic magnetic measurements performed on single crystals.

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“…7(d)] and the reversal of magnetization proceeds via 1 3 -magnetization steps; ↑↑↑→↑↓↑→↓↓↓→↓↑↓→↑↑↑ as magnetic field is cycled up → down → up. Two models for the ↑↓↑ 1 3 -magnetization phase are plausible-an order of 2↑:1↓-spin chains parallel to the c axis, as observed in some frustrated triangular lattices such as CoV 2 O 6 , [22][23][24] or an ↑↓↑ order of successive Nd planes perpendicular to c. High-field neutron diffraction will be needed to distinguish between these possibilities.…”

Section: Discussionmentioning

confidence: 99%

Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba3B′Ru2O
Senn
¹
,
Kimber
²
,
Arévalo‐López
³

et al. 2013
Phys. Rev. B
35
10
62
3
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The magnetic and crystal structures of the title materials have been investigated using high-resolution neutron and synchrotron x-ray powder diffraction. Ferromagnetic Ru dimers are observed in the spin-ordered ground states of all three materials, evidencing an intradimer double exchange interaction. Antiferromagnetic order between dimers breaks the degeneracy of the triangular lattice but no distortion of the B = La and Y structures is observed. The magnetic ordering transition temperature increases with the radius of the B cation. An anomalous 120 K structural transition in Ba 3 NdRu 2 O 9 is attributed to Jahn-Teller distortion, evidenced by large-amplitude 6 deformations of the NdO 6 octahedra. Further lattice anomalies accompany magnetic ordering transitions at 24 and 18 K in Ba 3 NdRu 2 O 9 . Nd spins order ferromagnetically and a substantial magnetic anisotropy leads to large coercivity and 1 3 -magnetization steps in the magnetic hysteresis loop.

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Neutron diffraction study of monoclinic brannerite-type CoV2O6

Cited by 35 publications

References 17 publications

Theoretical study of the magnetic order inα-CoV2O6

Theoretical study of the magnetic order inα-CoV2O6

Magnetic Structure of Ground and Field Induced Ordered States of Low-Dimensional γ-CoV₂O₆

Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba3B′Ru2O
Senn
¹
,
Kimber
²
,
Arévalo‐López
³

et al. 2013
Phys. Rev. B
35
10
62
3
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Neutron diffraction study of monoclinic brannerite-type CoV2O6

Cited by 35 publications

References 17 publications

Theoretical study of the magnetic order inα-CoV2O6

Theoretical study of the magnetic order inα-CoV2O6

Magnetic Structure of Ground and Field Induced Ordered States of Low-Dimensional γ-CoV2O6

Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba3B′Ru2OSenn1, Kimber2, Arévalo‐López3 et al. 2013Phys. Rev. B3510623View full textAdd to dashboardCite

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About

Magnetic Structure of Ground and Field Induced Ordered States of Low-Dimensional γ-CoV₂O₆

Spin orders and lattice distortions of geometrically frustrated 6H-perovskites Ba3B′Ru2O
Senn
¹
,
Kimber
²
,
Arévalo‐López
³

et al. 2013
Phys. Rev. B
35
10
62
3
View full text Add to dashboard Cite