Effect of Na content and hydration on the excitation spectrum of the cobaltite NaxCoO2·yH2O (Effect of Na content and hydration on the excitation spectrum of the cobaltite NaxCoO2·yH2O)
P Lemmens, V Gnezdilov, N N Kovaleva, K Y Choi, H Sakurai, E Takayama-Muromachi, K Takada, T Sasaki, F C Chou, D P Chen, C T Lin, B Keimer.