A 59 nuclear quadrupole resonance (NQR) measurement on cobalt oxyhydrate Na0.35CoO2·yH2O superconductor was performed. NQR measurements were carried out using a phase-coherent spectrometer. The spin-lattice relaxation rate follwed a Curie-Weiss type temperature variation in the normal state that indicated two-dimensional antiferromagnetic spin correlations. As the temperature decreased, the spin-relaxation rate also decreased with no coherence peak and indicated non-s-wave superconductivity that was consistent with the existence of line nodes in the gap function.
|Number of pages||4|
|Journal||Physical Review Letters|
|Publication status||Published - Jan 30 2004|
ASJC Scopus subject areas
- Physics and Astronomy(all)