Unconventional Superconductivity and Nearly Ferromagnetic Spin Fluctuations in Na${}_x$CoO${}_2$$\cdot y$H${}_2$O

K. Ishida, Y. Ihara, Y. Maeno +7

Co NQR studies were performed in recently discovered superconductor Na${}_x$CoO${}_2$$\cdot y$H${}_2$O to investigate physical properties in the superconducting (SC) and normal states. T…