Abstract
59Co NMR measurements have been performed to study the local magnetic properties of [Ca2CoO3]0.62CoO2 (CCO) and [Ca2Co1.3Cu0.7O4]0.62CoO2 (CCCO). The 59Co NMR spectra with several components at 4.2 K under zero external field show the existence of the several Co sites. From the field dependence of the resonance frequency in CCO, three of them at higher frequencies are found to have antiferromagnetic (AF) internal fields, whereas the other two have paramagnetic (PM) and ferromagnetic (FM) ones. Furthermore, the changes in the 59Co NMR spectra of these misfit layered Co oxides with varying temperature are consistent with the phase diagrams proposed by the μ+SR and magnetization measurements.
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