A novel compound Fe-Ta-S crystal has been obtained using iodine vapor
transport technology. At low temperature this compound is in a strong
diamagnetic state, which is similar to a superconductor. The dependenc
e of the diamagnetic phase transition temperature on the magnetic held
could be expressed as T-c = T-c0 + gamma H-2/5 due to a strong coupli
ng between electrons and the magnetic field.