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Superconductivity, magnetic order, and quadrupolar order have beeninvestigated in the filled skutterudite systemPr$_{1-x}$Nd$_{x}$Os$_4$Sb$_{12}$ as a function of composition $x$ in magneticfields up to 9 tesla and at temperatures between 50 mK and 10 K. Electricalresistivity measurements indicate that the high field ordered phase (HFOP),which has been identified with antiferroquadruoplar order, persists to $x$$\sim$ 0.5. The superconducting critical temperature $T_c$ of PrOs$_4$Sb$_{12}$is depressed linearly with Nd concentration to $x$ $\sim$ 0.55, whereas theCurie temperature $T_{FM}$ of NdOs$_4$Sb$_{12}$ is depressed linearly with Prcomposition to ($1-x$) $\sim$ 0.45. In the superconducting region, the uppercritical field $H_{c2}(x,0)$ is depressed quadratically with $x$ in the range 0$<$ $x$ $\lesssim$ 0.3, exhibits a kink at $x$ $\approx$ 0.3, and thendecreases linearly with $x$ in the range 0.3 $\lesssim$ $x$ $\lesssim$ 0.6. Thebehavior of $H_{c2}(x,0)$ appears to be due to pair breaking caused by theapplied magnetic field and the exhange field associated with the polarizationof the Nd magnetic moments, in the superconducting state. From magneticsusceptibility measurements, the correlations between the Nd moments in thesuperconducting state appear to change from ferromagnetic in the range 0.3$\lesssim$ $x$ $\lesssim$ 0.6 to antiferromagnetic in the range 0 $<$ $x$$\lesssim$ 0.3. Specific heat measurements on a sample with $x$ $=$ 0.45indicate that magnetic order occurs in the superconducting state, as is alsoinferred from the depression of $H_{c2}(x,0)$ with $x$.

Superconductivity, magnetic order, and quadrupolar order in the filled skutterudite system Pr$_{1-x}$Nd$_{x}$Os$_4$Sb$_{12}$