Unconventional Superconductivity and Electron Correlations in the Cobalt Oxyhydrate NA0.35CoO2 · yH2O from Nuclear Quadrupole Resonance

Tatsuya Fujimoto, Guo Qing Zheng, Y. Kitaoka, R. L. Meng, J. Cmaidalka, C. W. Chu

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149 Citations (Scopus)


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.

Original languageEnglish
Article number047004
Pages (from-to)470041-470044
Number of pages4
JournalPhysical Review Letters
Issue number4
Publication statusPublished - Jan 30 2004
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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