NMR and Neutron Scattering Studies of Quasi One-Dimensional Magnet CuV2O6

Kikuchi, Jun; Ishiguchi, Kazuhiro; Motoya, Kiyoichiro; Itoh, Makoto; Inari, Kazunori; Eguchi, Naotoshi; Akimitsu, Jun

doi:10.1143/jpsj.69.2660

Cited by 27 publications

(24 citation statements)

References 10 publications

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“…Two possible magnetic structures were identified from a previous neutron diffraction study of CuV 2 O 6 . 8 Both models have ferromagnetic spin chains but they differ in the couplings between chains. Model A has antiferromagnetic coupling between chains along a only leading to a propagation vector of ͑0,0,0͒, whereas the model B has antiferromagnetic couplings along a and c, giving a ͑0,0,1/2͒ vector.…”

Section: Discussionmentioning

confidence: 99%

“…6,7 The intrachain and interchain exchange interactions were estimated to be J 1 / k = 34 K and J 2 / k = 16.5 K, respectively, by fitting an antiferromagnetic spin 1 / 2 Heisenberg chain model and CuV 2 O 6 was also studied by powder neutron diffraction and 51 V and Cu NMR. 8 The exchange interactions were further examined by spin dimer analysis using the extended Hückel method. 9 Heat capacity measurements 10 confirmed the onset of long range order in CuV 2 O 6 to be 22.5 K and Zn doping experiments have shown rapid depression of long range antiferromagnetic order.…”

Section: Introductionmentioning

confidence: 99%

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Disrupted antiferromagnetism in the branneriteMnV2O6

Kimber

Attfield

2007

Phys. Rev. B

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Magnetic order in brannerite type MnV 2 O 6 has been studied by magnetization measurements and low temperature powder neutron diffraction. A sharp transition to a three-dimensionally ordered antiferromagnetic state is observed at T N = 20 K. Neutron diffraction at 5 K shows the spin structure to have a ͑0 0 1/2͒ propagation vector with Mn 2+ moments of 4.77͑7͒ B ordered parallel to b. Observed ferromagnetic order within chains of edge-sharing MnO 6 octahedra is consistent with a positive Weiss temperature of 5.8 K. The long range coherence of the magnetic order is limited, with a coherence length of 900 Å resulting from dilution of the Mn sites by 3% V due to intrinsic antisite disorder. The magnetic behavior of MnV 2 O 6 is markedly different to that of the analogue CuV 2 O 6 in which spin chain correlations were reported.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Disrupted antiferromagnetism in the branneriteMnV2O6

Kimber

Attfield

2007

Phys. Rev. B

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“…4(a)]. Previous work on related Mn-and CuV 2 O 6 materials 24,28 has shown that simple collinear ground states consisting of ferromagnetic chains coupled antiferromagnetically are found. However, neither of these compounds has strong single-ion anisotropy, which is expected to complicate the magnetic ordering.…”

Section: B Neutron Powder Diffraction Measurementsmentioning

confidence: 99%

Metamagnetism and soliton excitations in the modulated ferromagnetic Ising chain CoV2O6

et al. 2011

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We report a combination of physical property and neutron scattering measurements for polycrystalline samples of the one-dimensional spin chain compound CoV2O6. Heat capacity measurements show that an effective S = 1/2 state is found at low temperatures and that magnetic fluctuations persist up to ∼6.TN. Above TN= 6.3 K, measurements of the magnetic susceptibility as a function of T and H show that the nearest neighbour exchange is ferromagnetic. In the ordered state, we have discovered a crossover from a metamagnet with strong fluctuations between 5 K and TN to a state with a 1/3 magnetisation plateau at 2 < T < 5 K. We use neutron powder diffraction measurements to show that the AFM state has incommensurate long range order and inelastic time of flight neutron scattering to examine the magnetic fluctuations as a function of temperature. Above TN, we find two broad bands between 3.5 and 5 meV and thermally activated low energy features which correspond to transitions within these bands. These features show that the excitations are deconfined solitons rather than the static spin reversals predicted for a uniform FM Ising spin chain. Below TN, we find a ladder of states due to the confining effect of the internal field. A region of weak confinement below TN, but above 5 K, is identified which may correspond to a crossover between 2D and 3D magnetic ordering.

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“…The magnetic properties of brannerite type MV 2 O 6 transition metal vanadates (M¼Mn [4][5][6], Co [6][7][8][9], Ni [6,7], Cu [6,7,[10][11][12][13]) have been widely studied. Their structures are based on that of the mineral brannerite, UTi 2 O 6 , which crystallises in monoclinic space group C2/m.…”

Section: Introductionmentioning

confidence: 99%