SN-119 MOSSBAUER AND MAGNETIZATION STUDIES OF CO2SCSN

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.