Magnetization measurements on the Heusler alloy Co2SCSn show that the
system undergoes a transition from a paramagnetic state to a possible
helimagnetic state at T(c)=238 K, and exhibits spin-glass behavior bel
ow 100 K. Sn-119 Mossbauer spectra of Co2ScSn are found to be influenc
ed significantly by heat treatment. Single-dip spectra are observed ab
ove T(c) as expected from the cubic symmetry at the Sn sites. The tran
sferred hyperfine field at the Sn nuclei appears below T(c), increases
with decreasing temperature, and has a value of 38 kOe at 4.2 K. The
temperature dependence of the hyperfine field at the Sn nuclei shows a
small break at 100 K which correlates with the onset of the spin-glas
s transition.