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59Co-NMR Knight Shift of the Superconducting NaxCoO2.yH2O by Kobayashi, Yoshiaki; Yokoi, Mai; Sato, Masatoshi is a scholarly article available to read on EtoBox.

What is 59Co-NMR Knight Shift of the Superconducting NaxCoO2.yH2O about?

Layered Co oxide NaxCoO2.yH2O with the superconducting transition temperature Tc =4.5 K has been studied by 59Co-NMR. The Knight shift K estimated from the observed spectra for powder sample exhibits almost temperature(T)-independent behavior above Tc and decreases with decreasing T below Tc. This result and the existence of the coherence peak in the spin-lattice-relaxation-rate versus T curve reported by the present authors indicate, naively speaking, that the singlet order parameter with s-wave symmetry is realized in NaxCoO2.yH2O. Differences of the observed behaviors between the spectra of the non-aligned sample and the one aligned in epoxy adhesive by applying the external magnetic field are discussed.

Author

Kobayashi, Yoshiaki; Yokoi, Mai; Sato, Masatoshi

Published

2003

Language

EN