MAGNETIC-ORDERING IN TB3SB4AU3

We have performed a neutron diffraction study of the magnetic ordering in Tb3Sb4Au3, a compound which is isostructural with the Kondo insula tor Ce3Bi4Pt3. A powder sample was studied using the C2 DUALSPEC diffr actometer at Chalk River Laboratories between 5 and 20 K. The temperat ure for the onset of antiferromagnetic order is 16 K, in agreement wit h susceptibility measurements. Sharp incommensurate magnetic peaks, in dicating long-range order, develop below the Neel transition. At lower temperatures, broader commensurate peaks are observed at lower angles indicating development of further, short-range order. (C) 1998 Elsevi er Science B.V. All rights reserved.