Abstract
Na 23 NMR was measured for newly synthesized superconducting and non-superconducting bilayer-hydrated (BLH) Na x CoO 2 · y H 2 O compounds systematically prepared by time-controlling duration-effect method of the sample preparation in high humidity atmosphere. The nuclear spin-lattice relaxation rate 1 / T 1 of Na 23 shows a ferromagnetic power-law behavior ( T 0.7 ) for both superconducting and non-superconducting BLH compounds in the low temperature regime, which has been also observed in Na 0.7 CoO 2 , while the order of amplitude of 1 / T 1 is substantially suppressed in BLH cases. Therefore, the in-plane ferromagnetic fluctuation still remains after the intercalation of water molecules although the inter-plane antiferromagnetic correlation is weakened, suggesting that the superconductivity occurs in the vicinity of the quantum critical point of the A-type spin fluctuations in the phase diagram of the novel Na x CoO 2 · y H 2 O system.
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