Crossover from itinerant to localized states in the thermoelectric oxide [Ca${}_2$CoO${}_3$]${}_{0.62}$[CoO${}_2$]

H. Sakabayashi, R. Okazaki

The layered cobaltite [Ca${}_2$CoO${}_3$]${}_{0.62}$[CoO${}_2$], often expressed as the approximate formula Ca${}_3$Co${}_4$O${}_9$, is a promising candidate for efficient oxide thermoelectrics…