Evidence for d-wave pairing in the cobalt oxide superconductor Nax CoO2 · 1.3 H2 O

K. Matano, Guo Qing Zheng, D. P. Chen, C. T. Lin

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We report the spin susceptibility in the superconducting state of the cobalt oxide superconductor Nax CoO2 · 1.3 H2 O, via the 59Co Knight shift measurements. Along both a- and c-axis directions, the shift decreases below Tc. At T = 1.7 K, the shift along the a-axis, Ka, increases with increasing the strength of magnetic field (H), following a sqrt(H) variation. Together with the T3 dependence of the spin-lattice relaxation rate, 1 / T1, these results indicate unambiguously that the Cooper pairs are in the spin-singlet form and that there exist nodes in the gap function. The data are most consistent with a d-wave symmetry.

Original languageEnglish
Pages (from-to)1107-1108
Number of pages2
JournalPhysica B: Condensed Matter
Volume403
Issue number5-9
DOIs
Publication statusPublished - Apr 1 2008

Keywords

  • NMR
  • Na CoO · y H O
  • Superconductivity
  • d-Wave symmetry

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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