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In order to investigate the relationship between superconductivity andmagnetism in bilayer-hydrate cobaltate Na_x(H_3O)_zCoO_2 \cdot yH_2O, Conuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR)measurements were performed on three different samples, which demonstratevarious ground states at low temperatures. The appearance of small internalfields is observed in the NQR spectra below approximately 6 K on one of thesamples that possesses the largest c-axis length and the highest NQR frequency.The other two samples exhibit superconducting transition in zero magneticfield, while these two samples show different ground states in the magneticfields greater than 5 T. The comparison of the NMR spectra of these two samplesobtained in high magnetic fields reveals the appearance of static internalmagnetic fields at the Co site below 4 K in the sample that possesses theintermediate c-axis length and the NQR frequency.

Magnetic anomalies of hydrous cobaltate compound Na_x(H_3O)_zCoO_2 \cdot yH_2O detected by NMR and NQR measurements