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. Physical Review B, 89(10):104401, 3, 2014. Paper Website abstract bibtex 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.
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title = {Exchange interactions in Ca3Co2O6 probed locally by NMR},
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year = {2014},
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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.},
bibtype = {article},
author = {Allodi, G. and Santini, P. and Carretta, S. and Agrestini, S. and Mazzoli, C. and Bombardi, A. and Lees, M. R. and De Renzi, R.},
journal = {Physical Review B},
number = {10}
}
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