The kinetic processes at triple points in the 4He melting curve

The kinetics of BCC-HCP phase transition along the 4He melting curve is studied in the temperature range of 1.25 to 2.0 K in the vicinity of triple points (BCC-HCP-He II and BCC-HCP-He I). The samples are produced by the capillary blocking technique, and the kinetics is investigated by the precise pressure measurements. It is found that far from the triple points the variation in the pressure with the temperature along the melting curve can be described by the exponential dependences. When passing though the triple points, the behavior of pressure and temperature becomes anomalous, favouring the assumption of crystal remelting under structure phase transition