Intermediate-valence behavior of the transition-metal oxide CaCu${}_3$Ru${}_4$O${}_{12}$

A. Krimmel, A. Günther, W. Kraetschmer +7

The transition--metal oxide CaCu${}_3$Ru${}_4$O${}_{12}$ with perovskite--type structure shows characteristic properties of an intermediate--valence system. The temperature--dependent su…