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Thermal expansion and forced magnetostriction of MnSi were measured as afunction of temperature down to 5 K and magnetic field to 3 T. The small length(volume) discontinuity at the magnetic phase transition in MnSi decreases withapplication of magnetic field to a value $\Delta L/L \sim 10^{-7}$, and thensuddenly the discontinuity seemingly jumps to zero. Thermal expansivity peaksstrongly deteriorate with magnetic fields. No specific features identifying atricritical point were observed. We propose that the Frenkel concept ofheterophase fluctuations may be relevant in the current case. Therefore, wesuggest that the magnetic phase transition in MnSi always remains first orderat any temperature and magnetic field, but the transition is progressivelysmoothed by heterophase fluctuations. These results question the applicabilityof a model of a fluctuation-induced first order phase transition for MnSi.Probably a model of coupling of an order parameter with other degrees offreedom is more appropriate.

Thermal expansion and magneto-volume studies of the itinerant helical magnet MnSi