  We present the structural ordering and the associated physical behavior of a
Ni-Mn-Si Laves phase, Mn(Ni$_{0.6}$Si$_{0.4})_2$. The high-resolution
transmission electron microscopy and electron energy loss spectroscopy analysis
were performed to resolve a distinct atomic ordering of the system. The study
determined the origin of the short-range ordering to be the unique arrangement
between Ni and Si atoms. The study also presents the atomic resolution mapping
of the Si atoms which has never been reported by any previous studies. With
further electrical conductivity measurement, we find one of the consequences of
the unique ordering reflected in a semiconducting like temperature dependence
of the compound.
