LINEAR AND NONLINEAR MAGNETIC-SUSCEPTIBILITY OF U1-XTHXBE13

We report measurements of the isothermal magnetization of U1-xThxBe13 at 2.5 K, in fields to 18 T, on samples where 0 less than or equal to x less than or equal to 1. Linear (chi(1)) and nonlinear (chi(3)) cont ributions to the susceptibility are extracted from the data and studie d as a function of thorium concentration x. We find chi(3) to be indep endent of x to about x = 0.9 while chi(1) shows an upturn as x --> 1, an upturn which we interpret as a reduction in a cooperative Kondo lik e compensation of the uranium magnetic moments.