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Spin correlations in Ca3Co2O6: Polarized-neutron diffraction and Monte Carlo study

Paddison, Joseph A. M.; Agrestini, Stefano; Lees, Martin R.; Fleck, Catherine L.; Deen, Pascale LU ; Goodwin, Andrew L.; Stewart, J. Ross and Petrenko, Oleg A. (2014) In Physical Review B (Condensed Matter and Materials Physics) 90(1).
Abstract
We present polarized-neutron diffraction measurements of the Ising-type spin-chain compound Ca3Co2O6 above and below the magnetic ordering temperature T-N. Below T-N, a clear evolution from a pure spin-density wave (SDW) structure to a mixture of SDW and commensurate antiferromagnet (CAFM) structures is observed on cooling. For a rapidly cooled sample, the majority phase at low temperature is the SDW, while if the cooling is performed sufficiently slowly, then the SDW and the CAFM structure coexist between 1.5 and 10 K. Above T-N, we use Monte Carlo methods to analyze the magnetic diffuse scattering data. We show that both intrachain and interchain correlations persist above T-N, but are essentially decoupled. Intrachain correlations... (More)
We present polarized-neutron diffraction measurements of the Ising-type spin-chain compound Ca3Co2O6 above and below the magnetic ordering temperature T-N. Below T-N, a clear evolution from a pure spin-density wave (SDW) structure to a mixture of SDW and commensurate antiferromagnet (CAFM) structures is observed on cooling. For a rapidly cooled sample, the majority phase at low temperature is the SDW, while if the cooling is performed sufficiently slowly, then the SDW and the CAFM structure coexist between 1.5 and 10 K. Above T-N, we use Monte Carlo methods to analyze the magnetic diffuse scattering data. We show that both intrachain and interchain correlations persist above T-N, but are essentially decoupled. Intrachain correlations resemble the one-dimensional ferromagnetic Ising model, while interchain correlations resemble the frustrated triangular-lattice antiferromagnet. Using previously published bulk property measurements and our neutron diffraction data, we obtain values of the ferromagnetic and antiferromagnetic exchange interactions and the single-ion anisotropy. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
90
issue
1
publisher
American Physical Society
external identifiers
  • wos:000341659200004
  • scopus:84904438585
ISSN
1098-0121
DOI
10.1103/PhysRevB.90.014411
language
English
LU publication?
yes
id
118b1215-58de-4db8-857e-a70089fe2509 (old id 4716999)
date added to LUP
2014-11-06 12:56:28
date last changed
2017-04-09 04:02:29
@article{118b1215-58de-4db8-857e-a70089fe2509,
  abstract     = {We present polarized-neutron diffraction measurements of the Ising-type spin-chain compound Ca3Co2O6 above and below the magnetic ordering temperature T-N. Below T-N, a clear evolution from a pure spin-density wave (SDW) structure to a mixture of SDW and commensurate antiferromagnet (CAFM) structures is observed on cooling. For a rapidly cooled sample, the majority phase at low temperature is the SDW, while if the cooling is performed sufficiently slowly, then the SDW and the CAFM structure coexist between 1.5 and 10 K. Above T-N, we use Monte Carlo methods to analyze the magnetic diffuse scattering data. We show that both intrachain and interchain correlations persist above T-N, but are essentially decoupled. Intrachain correlations resemble the one-dimensional ferromagnetic Ising model, while interchain correlations resemble the frustrated triangular-lattice antiferromagnet. Using previously published bulk property measurements and our neutron diffraction data, we obtain values of the ferromagnetic and antiferromagnetic exchange interactions and the single-ion anisotropy.},
  articleno    = {014411},
  author       = {Paddison, Joseph A. M. and Agrestini, Stefano and Lees, Martin R. and Fleck, Catherine L. and Deen, Pascale and Goodwin, Andrew L. and Stewart, J. Ross and Petrenko, Oleg A.},
  issn         = {1098-0121},
  language     = {eng},
  number       = {1},
  publisher    = {American Physical Society},
  series       = {Physical Review B (Condensed Matter and Materials Physics)},
  title        = {Spin correlations in Ca3Co2O6: Polarized-neutron diffraction and Monte Carlo study},
  url          = {http://dx.doi.org/10.1103/PhysRevB.90.014411},
  volume       = {90},
  year         = {2014},
}