Robust antiferromagnetism in the R$_{1-x}$La$_x$Cu$_2$Ge$_2$ series: comparison of Ce$_{1-x}$La$_x$Cu$_2$Ge$_2$ and Nd$_{1-x}$La$_x$Cu$_2$Ge$_2$

Recently, remarkably robust and correlated coherence and antiferromagnetism were found in the Ce$_{1-x}$La$_x$Cu$_2$Ge$_2$ series [H. Hodovanets et al., {\it PRL} {\bf 114}, 236601 (2015)]. Whereas Ce is known to hybridize and its compounds often show a strongly correlated behavior, Nd magnetism is associated with a local moment nature. In this talk, we report new measurements on the Ce$_{1-x}$La$_x$Cu$_2$Ge$_2$ series that extend the antiferromagnetic and coherence lines even further and then compare the data for Ce$_{1-x}$La$_x$Cu$_2$Ge$_2$ and the data for a local moment based Nd$_{1-x}$La$_x$Cu$_2$Ge$_2$ series to separate effects of Ce - hybridization from the behavior that might be common in the R$_{1-x}$La$_x$Cu$_2$Ge$_2$ (R=magnetic rare earth) family.