Multiple ordered phases in the filled skutterudite compound   PrOs$_{4}$As$_{12}$
  Magnetization, specific heat, and electrical resistivity measurements were made on single crystals of the filled skutterudite compound PrOs$_{4}$As$_{12}$. Specific heat measurements indicate an electronic specific heat coefficient $\gamma$ $\sim 50-200$ mJ/mol K$^{2}$ at temperatures 10 K $\leq T \leq 18$ K, and $\sim 1$ J/mol K$^{2}$ for $T \leq 1.6$ K. Magnetization, specific heat, and electrical resistivity measurements reveal the presence of two, or possibly three, ordered phases at temperatures below $\sim 2.3$ K and in fields below $\sim 3$ T. The low temperature phase displays antiferromagnetic characteristics, while the nature of the ordering in the other phase(s) has yet to be determined. 
W.M. Yuhasz, N.P. Butch, T.A. Sayles, P.-C. Ho, J.R. Jeffries, T.   Yanagisawa, N.A. Frederick, M.B. Maple, Z. Henkie, A. Pi...