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Spin correlations in Ca3Co2O6 : polarized-neutron diffraction and Monte Carlo study
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Paddison, Joseph A. M., Agrestini, Stefano, Lees, Martin R., Fleck, Catherine L., Deen, Pascale P., Goodwin, Andrew L., Stewart, J. Ross and Petrenko, Oleg (2014) Spin correlations in Ca3Co2O6 : polarized-neutron diffraction and Monte Carlo study. Physical Review B (Condensed Matter and Materials Physics), Volume 90 (Number 1). Article number 014411 . doi:10.1103/PhysRevB.90.014411 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.90.014411
Abstract
We present polarized-neutron diffraction measurements of the Ising-type spin-chain compound Ca3Co2O6 above and below the magnetic ordering temperature TN. Below TN, 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 TN, we use Monte Carlo methods to analyze the magnetic diffuse scattering data. We show that both intrachain and interchain correlations persist above TN, 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.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | Physical Review B (Condensed Matter and Materials Physics) | ||||||
Publisher: | American Physical Society | ||||||
ISSN: | 1098-0121 | ||||||
Official Date: | 11 July 2014 | ||||||
Dates: |
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Volume: | Volume 90 | ||||||
Number: | Number 1 | ||||||
Article Number: | Article number 014411 | ||||||
DOI: | 10.1103/PhysRevB.90.014411 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access |
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