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| VOLUME 85 (2007) | ISSUE 9 | PAGE 555 |
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Absence of low temperature anomaly on the melting curve of 4He
I. A. Todoshchenko, H. Alles, H. J. Junes, A. Ya. Parshin+, V. Tsepelin*
Low Temperature Laboratory, Helsinki University of Technology, FIN-02015 HUT, Finland +P. L. Kapitza Institute for Physical Problems RAS, 119334 Moscow, Russia *Department of Physics, Lancaster University, Lancaster, LA1 4YB, United Kingdom PACS: 05.70.-a, 67.40.Db, 67.80.-s
Abstract
We have measured the melting pressure and pressure in the liquid at constant density of ultra-pure 4He (0.3 ppb of 3He impurities) with the accuracy of about 0.5 μbar in the temperature range from 10 to 320 mK. Our measurements show that the anomaly on the melting curve below 80 mK which we have recently observed [9tod-T06] is entirely due to an anomaly in the elastic modulus of Be-Cu from which our pressure gauge is made of. We thus conclude that the melting pressure of 4He follows the T4 law due to phonons in the whole temperature range from 10 to 320 mK without any sign of a supersolid transition. |