The Vollhardt crossing point at high magnetic field

Direct measurements of the Vollhardt crossing point coordinates were performed using data of dilatometric and ultrasound experiments on MnSi. As is shown the crossing points are not invariant in the extended range of magnetic field and, probably, should be viewed as a side effects of flattening and spreading out the fluctuation extremums by a magnetic field [4]. Correspondingly the crossing point can not be identified with a characteristic energy scale controlling the phase transition. So further studies are needed to understand the intriguing features of the phase diagram of helical itinerant magnet MnSi. •Direct measurements of the Vollhardt crossing point coordinates in MnSi were performed.•It is shown the crossing points are not invariant in the extended range of magnetic field.•Correspondingly the crossing point can not be identified with a characteristic feature controlling the phase transition.•So further studies are needed to understand intriguing features of the phase diagram of helical itinerant magnet MnSi.