RESISTIVITY STUDIES OF CUBIC AMERICIUM HYDRIDES FROM 20 TO 300 K

We report low temperature resistivity measurements of cubic americium hydrides. For all compositions AmH2+n 0 less than or equal to x less t han or equal to 0.7, there is a change in temperature dependence of th e resistivity at 120 K that is yet unexplained. For AmH26, there is an additional change observed near 210 K typical of long-range ordering of octahedral hydrogen that is typical of fluorite-type neptunium, plu tonium, and rare-earth hydrides.