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Exchange interactions in Ca3Co2O6 probed locally by NMR
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Allodi, G., Santini, P., Carretta, S., Agrestini, S., Mazzoli, C., Bombardi, A., Lees, Martin R. and De Renzi, R. (2014) Exchange interactions in Ca3Co2O6 probed locally by NMR. Physical Review B (Condensed Matter and Materials Physics), 89 (10). 104401. doi:10.1103/PhysRevB.89.104401 ISSN 1098-0121.
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Official URL: http://dx.doi.org/10.1103/PhysRevB.89.104401
Abstract
We have measured the nuclear spin-lattice relaxation of 59Co in the geometrically frustrated Ising-type spin-chain system Ca3Co2O6 as a function of temperature and applied magnetic field. In the nearly-saturated ferrimagnetic and ferromagnetic regimes considered here, the field-dependent energy scales governing the spin-lattice relaxation rates reflect the energy cost of a spin flip in the Co ions adjacent to the probed nuclei. This results in a thermally activated form for the nuclear relaxation rates, which can be exploited as a local probe of the exchange interactions. In particular, the measurements enable the values of intra- and interchain exchange constants J1, J2+J3 to be directly extracted from the data. By using a quasi-one-dimensional model, we then determine the value of J2 consistent with the spin-density-wave order observed in zero field.
Item Type: | Journal Article | ||||
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Alternative Title: | Exchange interactions in Ca3Co2O6 probed locally by nuclear magnetic resonance | ||||
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: | 3 March 2014 | ||||
Dates: |
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Volume: | 89 | ||||
Number: | 10 | ||||
Article Number: | 104401 | ||||
DOI: | 10.1103/PhysRevB.89.104401 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access |
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