$^{23}$Na NMR Study of Layered Superconductor $Na_xCoO_2- yH_2O$

H. Ohta; C. Michioka; Y. Itoh; K. Yoshimura; H. Sakurai; E. Takayama-Muromachi; K. Takada; T. Sasaki

doi:10.1016/j.physb.2006.01.317

paper

$^{23}$ Na NMR Study of Layered Superconductor $N a_{x} C o O_{2} - y H_{2} O$

arXiv:cond-mat/0507081 · doi:10.1016/j.physb.2006.01.317

Abstract

We measured $^{23}$ Na-NMR spectra and nuclear spin-lattice relaxation rates $^{23} (1/ T_{1})$ of superconducting and non-superconducting bilayer hydrate $N a_{x} C o O_{2} - y H_{2} O$ (x ~ 0.3, y ~ 1.3). The central resonance frequency shows a small but various shift due to the difference in the shielding effect by intercalated $H_{2} O$ molecules. The different shielding effect also gives a large difference in the magnitude of $^{23} (1/ T_{1})$ .

2 pages with 2 figures, submitted to Physica B (SCES '05)

23Na NMR Study of Layered Superconductor Nax​CoO2​−yH2​O

Abstract

$^{23}$ Na NMR Study of Layered Superconductor $N a_{x} C o O_{2} - y H_{2} O$