Melting curve of ⁴He: no sign of the supersolid transition down to 10 mK
Todoshchenko, I. A. · Alles, H. · Bueno, J. · Junes, H. J. · Parshin, A. Ya. · Tsepelin, V.
Original · EN
We have measured the melting curve of ⁴He in the temperature range from 10 to 400 mK with the accuracy of about 0.5 μbar. Crystals of different quality show the expected T⁴-dependence in the range from 80 to 400 mK without any sign of the supersolid transition, and the coefficient is in excellent agreement with available data on the sound velocity in liquid ⁴He and on the Debye temperature of solid ⁴He. Below 80 mK we have observed a small deviation from T⁴-dependence which however cannot be attributed to the supersolid transition because instead of decrease the entropy of the solid rather remains constant, about 2.5×10⁻⁶ R
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