Melting curve of ${}^4$He: no sign of the supersolid transition down to 10 mK

Abstract

We have measured the melting curve of ${}^4$He in the temperature range from 10 to 400 mK with the accuracy of about 0.5 $\mu$bar. Crystals of different quality show the expected $T^4$-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 ${}^4$He and on the Debye temperature of solid ${}^4$He. Below 80 mK we have observed a small deviation from $T^4$-dependence which however cannot be attributed to the supersolid transition because instead of decrease the entropy of the solid rather remains constant, about $2.5\times 10^{-6}$ $R$

4 pages, 2 figures, published in Physical Review Letters

References in corpus (1)

• Supersolid Helium at High Pressure

Cited by in corpus (6)

• What makes a crystal supersolid ?
• On the origin of the decrease in the torsional oscillator period of solid He4
• Solid 4He and the Supersolid Phase: from Theoretical Speculation to the Discovery of a New State of Matter? A Review of the Past and Present Status of Research
• Heat capacity peak in solid 4He: Effects of disorder and 3He impurities
• Absence of low temperature anomaly on the melting curve of ${}^4$He
• Finite size Berezinski-Kosterlitz-Thouless transition at grain boundaries in solid ${}^4$He and role of ${}^3$He impurities