)Si at x=0.15 along the critical trajectory*

We report results of studying the magnetization, specic heat and thermal expansion of a single
crystal with nominal composition (Mn_1-xFe_x)Si with x=0.15. We found no thermodynamic evidences
in favor of a second order phase transition in this material. The trajectory corresponding
to the present composition of (MnFe)Si is a critical one, i.e. approaching quantum critical point at
lowering temperature, but some properties may feel the cloud of helical fluctuations bordering the phase transition line.