Evolution of the phase diagrams in the pseudoternary system Pr$_{1-x}$Nd$_x$Os$_4$Sb$_{12}$*

The pseudo ternary system Pr$_{1-x}$Nd$_x$Os$_4$Sb$_{12}$ has been used as a model system to investigate the effect of ferromagnetism (FM) on the unconventional superconductivity (SC), the high field ordered phase (HFOP), and quantum critical behavior [1], that was observed in PrOs$_4$Sb$_{12}$. SC in this system disappears near the Nd concentration x $\sim$ 0.58. Between x $\sim$ 0.33 and $\sim$ 0.58, weak FM, confirmed by the $\mu$SR experiments [2], was found to coexist with SC. In order to further inspect the possible quantum critical behavior, a power-law analysis of the temperature dependence of the electrical resistivity data was performed. Upon suppression of SC, for samples in the range 0.33 $<$ x $<$ 0.58, the power-law exponent decreases from $\sim$ 1.8 toward 1 in the temperature region below 2.5\,K, resembling non-Fermi liquid behavior. Detailed T-x, H-x, and H-T phase diagrams for various x will be discussed. \\[4pt] [1] Ho, et. al., PRB 83, 024511 (2011).\\[0pt] [2] Ho, et. al., 2010 APS March Meeting, A38.00005 (2010).