Excitation of Multiple-Magnon Bound States in Co<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cl</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>·2<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">H</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>O

Torrance, J. B.; Tinkham, M.

doi:10.1103/physrev.187.595

Cited by 128 publications

(60 citation statements)

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“…35 The degeneracy of these excitations may also be lifted by applying magnetic fields, and the resulting spectrum of spin flips has also been observed using infrared transmission experiments. 36 The observation of sharp, almost dispersionless features in CoV 2 O 6 , as well as temperature-induced scattering, is inconsistent with these expectations. This shows that any Hamiltonian proposed for CoV 2 O 6 must include terms which account for the low crystallographic symmetry.…”

Section: Discussionmentioning

confidence: 93%

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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Section: Discussionmentioning

confidence: 93%

Metamagnetism and soliton excitations in the modulated ferromagnetic Ising chain CoV2O6

et al. 2011

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“…optical phonon mode identified at 3.65 meV in CoCl 2 · 2H 2 O [16,17]. In deuterated crystals, THz spectroscopy shows that this mode is shifted to energies around 3.3 meV [23].…”

Section: Resultsmentioning

confidence: 99%

“…The theory accounts for the bulk properties, i.e., the paramagnetic susceptibility tensor [14] and the low-temperature magnetization curves [13]. Assuming a pure Heisenberg interaction between the spins of the S = 3/2 ions, a set of exchange parameters can be derived, which describes not only the zero-field spin waves [20][21][22], but also the spin reversal excitations (magnon bound states) of clusters of two, three, or more neighboring spins along the c-axis chains [16,17], which are neglected by spin wave theory. The parameters and the detailed derivation of the cluster model will be published elsewhere [18].…”

Section: Discussionmentioning

confidence: 99%

“…These deviations are caused primarily by the finite interchain interactions. The weak 3D nature of the interactions in CoCl 2 · 2D 2 O implies that the excitations propagating along the chains consisting of single domain walls are quenched and replaced by excitations of bound pairs of domain walls, i.e., the excitations observed by Torrance and Tinkham [16,17]. The latter are accounted for by the four-spin cluster theory [18] and have been analyzed in detail by Shinkevich and Syljuåsen [28].…”

Section: Discussionmentioning

confidence: 99%

“…Within this approximation, the original isotropic spinexchange interaction obtains an Ising-like anisotropy quantified by J by Date and Motokawa in the microwave regime [15] and by Torrance and Tinkham in the far-infrared regime [16,17]. The g factors to be presented in Ref.…”

Section: The Chain Systemmentioning

confidence: 97%

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Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnetCoCl2·2D2Oin a transverse field

Larsen¹,

Schäffer

Hansen

et al. 2017

Phys. Rev. B

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. (2017). Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnet CoCl2·2D2O in a transverse field. Physical Review B, 96(17), [174424 ] We present experimental evidence for a quantum phase transition in the easy-axis S = 3/2 anisotropic quasione-dimensional ferromagnet CoCl 2 · 2D 2 O in a transverse field. Elastic neutron scattering shows that the magnetic order parameter vanishes at a transverse critical field μ 0 H c = 16.05(4) T, while inelastic neutron scattering shows that the gap in the magnetic excitation spectrum vanishes at the same field value, and reopens for H > H c . The field dependence of the order parameter and the gap are well described by critical exponents β = 0.45 ± 0.09 and zν close to 1/2, implying that the quantum phase transition in CoCl 2 · 2D 2 O differs significantly from the textbook version of a S = 1/2 Ising chain in a transverse field. We attribute the difference to weak but finite three-dimensionality of the magnetic interactions.

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Light scattering from phonons and magnons in CoCl₂ · 2H₂O

Helms

Scott

Toms

1979

J Raman Spectroscopy

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Excitation of Multiple-Magnon Bound States in CoCl2·2H2O

Cited by 128 publications

References 28 publications

Metamagnetism and soliton excitations in the modulated ferromagnetic Ising chain CoV2O6

Metamagnetism and soliton excitations in the modulated ferromagnetic Ising chain CoV2O6

Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnetCoCl2·2D2Oin a transverse field

Light scattering from phonons and magnons in CoCl₂ · 2H₂O

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Excitation of Multiple-Magnon Bound States in CoCl2·2H2O

Cited by 128 publications

References 28 publications

Metamagnetism and soliton excitations in the modulated ferromagnetic Ising chain CoV2O6

Metamagnetism and soliton excitations in the modulated ferromagnetic Ising chain CoV2O6

Spin excitations and quantum criticality in the quasi-one-dimensional Ising-like ferromagnetCoCl2·2D2Oin a transverse field

Light scattering from phonons and magnons in CoCl2 · 2H2O

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Light scattering from phonons and magnons in CoCl₂ · 2H₂O