Abstract
We report a 59Co NMR study on a quasi-one-dimensional cobalt oxide Ca3Co2O6 having the in-chain ferromagnetic and out-of-chain antiferromagnetic interactions. We have found an increase of the 59Co nuclear transverse relaxation rate 1/T2 at 6.105 T on cooling temperature below 200 K, much higher than the spin freezing temperature of 25 K at 0 T. The result suggests that the unusual slowing down of spin fluctuations in a wide temperature range, probably arising from the spin frustration on the triangular lattice of the ferromagnetic chains. The NMR signals wiped out below 80 K due to the fast relaxation relive below 17 K, the spin freezing temperature measured at the NMR time window.
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