Evidence for d-wave pairing in the cobalt oxide superconductor NaxCoO2 1.3H2O

Authors

K Matano, Okayama University
Guo-qing Zheng, Okayama University
Dapeng Chen, University of WollongongFollow
C T. Lin, Max-Planck-Institute For Solid State ResearchFollow

RIS ID

41050

Publication Details

Matano, K., Zheng, G., Chen, D. P. & Lin, C. T. (2008). Evidence for d-wave pairing in the cobalt oxide superconductor NaxCoO2 1.3H2O. Physica B: Condensed Matter, 403 (5-9), 1107-1108.

Abstract

We report the spin susceptibility in the superconducting state of the cobaltoxidesuperconductorNaxCoO2·1.3H2O, via the 59Co Knight shift measurements. Along both a- and c-axis directions, the shift decreases below Tc. At , the shift along the a-axis, Ka, increases with increasing the strength of magnetic field (H), following a 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.