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- W1551216685 abstract "A weak magnetic order was found in a non-superconducting bilayered-hydrate Na$_{x}$CoO$_{2}cdot y$H$_{2}$O sample by a Co Nuclear Quadrupole Resonance (NQR) measurement. The nuclear spin-lattice relaxation rate divided by temperature $1/T_1T$ shows a prominent peak at 5.5 K, below which a Co-NQR peak splits due to an internal field at the Co site. From analyses of the Co NQR spectrum at 1.5 K, the internal field is evaluated to be $sim$ 300 Oe and is in the $ab$-plane. The magnitude of the internal field suggests that the ordered moment is as small as $sim 0.015$ $mu_B$ using the hyperfine coupling constant 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 stronger magnetic fluctuations. A possible phase diagram in Na$_{x}$CoO$_{2}cdot y$H$_{2}$O is depicted using $T_c$ and $nu_Q$, in which the crystal distortion along the c-axis of the tilted CoO$_2$ octahedron is considered to be a physical parameter. Superconductivity with the highest $T_c$ is seemingly observed in the vicinity of the magnetic phase, suggesting strongly that the magnetic fluctuations play an important role for the occurrence of the superconductivity." @default.
- W1551216685 created "2016-06-24" @default.
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- W1551216685 date "2005-03-01" @default.
- W1551216685 modified "2023-09-25" @default.
- W1551216685 title "Weak Magnetic Order in Bilayered-Hydrate Na<sub><i>x</i></sub>CoO<sub>2</sub>·<i>y</i>H<sub>2</sub>O Structure Probed by Co Nuclear Quadrupole Resonance –Proposed Phase Diagram in Superconducting Na<sub><i>x</i></sub>CoO<sub>2</sub>·<i>y</i>H<sub>2</sub>O–" @default.
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- W1551216685 doi "https://doi.org/10.1143/jpsj.74.867" @default.
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