Melting curve of 4He: no sign of the supersolid transition down to 10 mK
I. A. Todoshchenko, H. Alles, J. Bueno, H. J. Junes, A. Ya. Parshin, V. Tsepelin
Abstract
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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