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A weak magnetic order was found in a non-superconducting bilayered-hydrateNa$_{x}$CoO$_{2}\cdot y$H$_{2}$O sample by a Co Nuclear Quadrupole Resonance(NQR) measurement. The nuclear spin-lattice relaxation rate divided bytemperature $1/T_1T$ shows a prominent peak at 5.5 K, below which a Co-NQR peaksplits due to an internal field at the Co site. From analyses of the Co NQRspectrum at 1.5 K, the internal field is evaluated to be $\sim$ 300 Oe and isin the $ab$-plane. The magnitude of the internal field suggests that theordered moment is as small as $\sim 0.015$ $\mu_B$ using the hyperfine couplingconstant reported previously. It is shown that the NQR frequency $\nu_Q$correlates with magnetic fluctuations from measurements of NQR spectra and$1/T_1T$ in various samples. The higher-$\nu_Q$ sample has the strongermagnetic fluctuations. A possible phase diagram in Na$_{x}$CoO$_{2}\cdoty$H$_{2}$O is depicted using $T_c$ and $\nu_Q$, in which the crystal distortionalong the c-axis of the tilted CoO$_2$ octahedron is considered to be aphysical parameter. Superconductivity with the highest $T_c$ is seeminglyobserved in the vicinity of the magnetic phase, suggesting strongly that themagnetic fluctuations play an important role for the occurrence of thesuperconductivity.Comment: 5 pages, 6 figures, submitted to J. Phys. Soc. Jp

journal of the physical society of japan

Weak Magnetic Order in Bilayered-Hydrate NaxCoO2·yH2O Structure Probed by Co Nuclear Quadrupole Resonance –Proposed Phase Diagram in Superconducting NaxCoO2·yH2O–