  We present the results of neutron diffraction studies on polycrystals of a
metallic kagome lattice, Tb3Ru4Al12, reported recently to undergo reentrant
magnetism, with the onset of long range antiferromagnetic order below (TN=) 22
K and spin-glass features below about 17 K. The present results reveal
long-range antiferromagnetic order of an incommensurate type with the moments
oriented along c-axis at all temperatures below TN. There are however notable
changes in the T dependence of propagation vector along b-axis across 17 K. An
observation of interest is that there is no decrease of intensity of magnetic
Bragg peaks on entrance into the glassy phase (that is, below 17 K). This
finding suggests that the magnetism of this compound is an exotic one and we
wonder whether this compound is an example for dynamical spin-glass freezing
phenomenon, as a consequence of geometrical frustration.
