Intermediate-valence behavior of the transition-metal oxide CaCu$_3$Ru$_4$O$_{12}$ (2009)
Krimmel, A., Günther, A., Kraetschmer, W., Dekinger, H., Büttgen, N., Eyert, V., ...
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 susceptibility...
NMR studies of the heavy fermion alloy Ce(Cu1-xNix)2Ge2 (1996)
Böhmer, Roland, Büttgen, N., Krimmel, A., Loidl, A.
A detailed 63Cu NMR investigation is presented for the heavy-fermion system Ce(Cu1-xNix)2Ge2, focusing especially on the alloying induced transition from magnetic order to pure Kondo-like behavior....