Extended s-wave pairing originating from the $a_{1g}$ band in Na${}_x$CoO${}_2\cdot y$ H${}_2$O

Kazuhiko Kuroki, Seiichiro Onari, Yukio Tanaka +2

Motivated by recent experiments and band calculation results, we investigate the possibility of superconductivity originating from the $a_{1g}$ band of Na${}_x$CoO${}_2\cdot y$H${}_2$O a…