NMR and NQR studies of the pairing symmetry in the superconducting state of Nax CoO2 · 1.3 H2 O

K. Matano, G. q. Zheng, D. P. Chen, C. T. Lin, J. Cmaidalka, R. L. Meng, C. W. Chu

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


We report intensive studies on the cobalt oxide superconductors Nax CoO2 · 1.3 H2 O via 59Co NMR and NQR measurements. In the sample with x = 0.26 and Tc = 4.6, we find that the spin-lattice relaxation rate 1 / T1 shows a T3 variation below Tc and down to very low temperatures, which indicates the presence of line nodes in the superconducting (SC) gap function. We have also studied the spin susceptibility below Tc via the Knight shift measurement. The spin part of the Knight shift decreases below Tc in both the a- and c-directions indicating singlet spin state of the Cooper pairs. Our results strongly suggest that the superconducting state is a d-wave state.

Original languageEnglish
Pages (from-to)687-689
Number of pages3
JournalJournal of Magnetism and Magnetic Materials
Issue number2 SUPPL. PART 1
Publication statusPublished - Mar 1 2007


  • NMR
  • NQR
  • Na CoO · y H O
  • Superconductivity
  • Triangular lattice

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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