A unified origin for the 3D magnetism and superconductivity in Na${}_x$CoO${}_2$

Kazuhiko Kuroki, Shuhei Ohkubo, Takumi Nojima +3

We analyze the origin of the three dimensional (3D) magnetism observed in nonhydrated Na-rich Na${}_x$CoO${}_2$ within an itinerant spin picture using a 3D Hubbard model. The origin is…