MAGNETIC-PROPERTIES OF NPSB-NPTE MIXED SINGLE-CRYSTALS

NpSb and NpTe show antiferromagnetic order below 197 and 30 K, respectively. Magnetization experiments on samples with Te concentration x = 0.05, 0.10, 0.15 are reported. Hysteresis loops were measured at 4.2 K in magnetic fields applied along the main cubic axes. Neutron experiments have been carried out on the sample x = 0.05. Samples with x = 0.10 and 0.15 are ferromagnets with moments along <111>. The sample with x = 0.05 is a collinear ferromagnet at high temperature (Tc = 143K). Below T0 = 89K an AF-type I component develops inducing a non-collinear ferromagnetic ordering with moments alternatively close to <111> and <111> directions. © 1990.