Exchange interactions in Ca3Co2O6 probed locally by NMR

Allodi, G.; Santini, P.; Carretta, S.; Agrestini, S.; Mazzoli, C.; Bombardi, A.; Lees, M. R.; De Renzi, R.

doi:10.1103/PhysRevB.89.104401

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Exchange interactions in Ca₃Co₂O₆ probed locally by NMR

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Agrestini, S.
Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Allodi, G., Santini, P., Carretta, S., Agrestini, S., Mazzoli, C., Bombardi, A., et al. (2014). Exchange interactions in Ca₃Co₂O₆ probed locally by NMR. Physical Review B, 89(10): 104401, pp. 1-5. doi:10.1103/PhysRevB.89.104401.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-86F8-1

Abstract

We have measured the nuclear spin-lattice relaxation of Co-59 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 J(1), J(2) + J(3) to be directly extracted from the data. By using a quasi-one-dimensional model, we then determine the value of J(2) consistent with the spin-density-wave order observed in zero field.