Metamagnetism and soliton excitations in the modulated ferromagnetic Ising chain CoV2O6
(2011) In Physical Review B (Condensed Matter and Materials Physics) 84(10).- Abstract
- 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 similar to 6T(N). Above T-N = 6.3 K, measurements of the magnetic susceptibility as a function of T and H show that the nearest-neighbor exchange is ferromagnetic. In the ordered state, we have discovered a crossover from a metamagnet with strong fluctuations between 5 K and T-N to a state with a 1/3 magnetization plateau at 2 < T < 5 K. We use neutron powder diffraction measurements to show that the antiferromagnetic state has... (More)
- 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 similar to 6T(N). Above T-N = 6.3 K, measurements of the magnetic susceptibility as a function of T and H show that the nearest-neighbor exchange is ferromagnetic. In the ordered state, we have discovered a crossover from a metamagnet with strong fluctuations between 5 K and T-N to a state with a 1/3 magnetization plateau at 2 < T < 5 K. We use neutron powder diffraction measurements to show that the antiferromagnetic state has incommensurate long-range order and inelastic time-of-flight neutron scattering to examine the magnetic fluctuations as a function of temperature. Above T-N, 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 ferromagnetic Ising spin chain. Below T-N, we find a ladder of states due to the confining effect of the internal field. A region of weak confinement below T-N, but above 5 K, is identified which may correspond to a crossover between two- and three-dimensional magnetic ordering. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/2180302
- author
- Kimber, Simon A. J. ; Mutka, Hannu ; Chatterji, Tapan ; Hofmann, Tommy ; Henry, Paul LU ; Bordallo, Heloisa ; Argyriou, Dimitri LU and Attfield, J. Paul
- organization
- publishing date
- 2011
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B (Condensed Matter and Materials Physics)
- volume
- 84
- issue
- 10
- article number
- 104425
- publisher
- American Physical Society
- external identifiers
-
- wos:000294922100004
- scopus:80053606117
- ISSN
- 1098-0121
- DOI
- 10.1103/PhysRevB.84.104425
- language
- English
- LU publication?
- yes
- id
- 80c61363-ef6f-40e4-8e70-16a1803462f6 (old id 2180302)
- date added to LUP
- 2016-04-01 12:58:20
- date last changed
- 2022-01-27 08:34:56
@article{80c61363-ef6f-40e4-8e70-16a1803462f6, abstract = {{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 similar to 6T(N). Above T-N = 6.3 K, measurements of the magnetic susceptibility as a function of T and H show that the nearest-neighbor exchange is ferromagnetic. In the ordered state, we have discovered a crossover from a metamagnet with strong fluctuations between 5 K and T-N to a state with a 1/3 magnetization plateau at 2 < T < 5 K. We use neutron powder diffraction measurements to show that the antiferromagnetic state has incommensurate long-range order and inelastic time-of-flight neutron scattering to examine the magnetic fluctuations as a function of temperature. Above T-N, 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 ferromagnetic Ising spin chain. Below T-N, we find a ladder of states due to the confining effect of the internal field. A region of weak confinement below T-N, but above 5 K, is identified which may correspond to a crossover between two- and three-dimensional magnetic ordering.}}, author = {{Kimber, Simon A. J. and Mutka, Hannu and Chatterji, Tapan and Hofmann, Tommy and Henry, Paul and Bordallo, Heloisa and Argyriou, Dimitri and Attfield, J. Paul}}, issn = {{1098-0121}}, language = {{eng}}, number = {{10}}, publisher = {{American Physical Society}}, series = {{Physical Review B (Condensed Matter and Materials Physics)}}, title = {{Metamagnetism and soliton excitations in the modulated ferromagnetic Ising chain CoV2O6}}, url = {{http://dx.doi.org/10.1103/PhysRevB.84.104425}}, doi = {{10.1103/PhysRevB.84.104425}}, volume = {{84}}, year = {{2011}}, }