Magnetisation and neutron studies of UTe and USbsub(0.8)Tesub(0.2)

Magnetization and neutron studies have been performed on single crystals of UTe and USbsub(0.8)Tesub(0.2). The magnetization measurements demonstrate that the magnetic moments are confined to the <111> direction, and that deviations from this direction, even in fields up to 90 kOe, are negligible at low temperatures. The saturated magnetic moments are 1.91 +- 0.05 μsub(B) in UTe and 2.58 +- 0.05 μsub(B) in USbsub(0.8)Tesub(0.2). Polarised-neutron experiments on the same single crystals give values for the 5f ordered moments of 2.25 +- 0.05 μsub(B) and 2.64 +- 0.05 μsub(B), respectively. The discrepancies of -0.34 μsub(B) in UTe and -0.06 μsub(B) in USbsub(0.8)Tesub(0.2) are attributed to the polarisation of the 6d-7s conduction electrons. (author)